PRE-LAB EXERCISES Manuals/AP Lab...IN-LAB EXERCISES Use the following modules to guide your...
Transcript of PRE-LAB EXERCISES Manuals/AP Lab...IN-LAB EXERCISES Use the following modules to guide your...
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PRE-LAB EXERCISES
A. Watch the video for 13.1 Muscular System Overview and observe the following:
1. What is the function of the muscular system?
2. How does a muscle change in order to accomplish its function?
3. What stimulates a muscle to contract?
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B. Watch the videos for 14.2 Skeletal Muscle Function Overview and 14.3 Muscle Contraction: Action Potential and observe the following:
1. What is the initial stimulus for muscle contraction?
2. Which neurotransmitter is released at the neuromuscular junction after the action potential arrives?
3. When receptors open at the neuromuscular junction, does sodium travel in or out of the muscle fiber?
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1. What is the basic functional unit of a muscle fiber?
2. Thick filaments are composed of ________________________________ and thin filaments are composed of ________________________________.
4. The action potential continues to travel down the muscle fiber on which structures? Which ion is released from the sarcoplasmic reticulum as this happens?
5. Draw and label a sketch of the neuromuscular junction in the space below.
C. Watch the video for 14.4 Muscle Contraction: Cross Bridge Formation and answer the following:
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3. When calcium is released from the sarcoplasmic reticulum, where does it bind?
4. When a myosin head binds to actin, it forms a _________________________________.
5. When a myosin head moves the actin toward the center of the sarcomere, this is called the
_________________________________.
6. What is the energy source that powers muscle contraction?
7. As myosin filaments pull the actin filaments toward the center of the sarcomere, will the muscle lengthen or shorten?
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IN-LAB EXERCISES
Use the following modules to guide your exploration of the pelvis and lower limb regions of the muscular system. As you explore the modules, locate the muscles on any available charts, models, or specimens.
The muscles of the pelvis and lower limb are generally larger than other muscles, because they serve to support the weight of the body as well as to provide movement. These muscles have different jobs, depending on where they are located, but they are all involved in moving the lower limb. A few are also able to move the trunk if the leg is fixed. You will be able to make a good guess about what action the muscle performs if you know which side of the joint the muscle crosses.
The long names of some of these muscles can be daunting, but they are often very descriptive. You can find origins, insertions, actions, and/or locations of these muscles, simply in the names. When reviewing the action of a muscle, it will be helpful to think about where the muscle is located and where the insertion is. Muscle physiology requires that a muscle will “pull,” instead of “push,” during contraction, and the insertion is the part that will move. Imagine that the muscle is “pulling” on the bone or tissue it is attached to at the insertion.
You may access 3D views in Visible Body’s Anatomy & Physiology app and manipulate the images to see different views and isolate each muscle. Be sure to use the book icon to read information specific to that muscle.
In the modules below, identify the following:
• Muscle location
• Origin(s) and insertion(s)
• Muscle action
• Nerve supply
You are responsible for the identification of all bold terms.
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A. Hip and Gluteal Muscles
View Module 16.46 Thigh: Iliopsoas, Module 16.47 Thigh: Gluteal, and Module 16.48 Thigh: Lateral Rotators.These muscles cross the hip joint, and therefore, they affect movement at that joint. Most of these muscles attach to the femur and cause the thigh to move, depending on exactly where the attachment is located. You will find the lateral rotators deep to the gluteus maximus and inferior to the gluteus minimus. As their group name implies, these muscles laterally rotate, as well as abduct or adduct, the thigh.
Module 16.46 Thigh: Iliopsoas
Psoas minor musclePsoas major muscle
Iliacus muscle
Module 16.47 Thigh: Gluteal
Gluteus maximus muscle Gluteus medius muscle
Gluteus minimus muscle
Tensor fascia lata (fasciae latae)
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Module 16.48 Thigh: Lateral Rotators (Part 1)
Iliacus muscle
Gluteus medius muscle
Gluteus minimus muscle
Obturator externus muscle
Module 16.48 Thigh: Lateral Rotators (Part 2)
Superior gemellus muscle
Inferior gemellus muscle
Piriformis muscle
Obturator internus muscle
Quadratus femoris muscle
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Insertion
Hip and Gluteal Muscles
OriginMuscle
Psoas major
Psoas minor
Iliacus
Gluteus medius
Gluteus maximus
Gluteus minimus
Tensor fasciae latae
Obturator externus
Obturator internus
Action Innervation
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Insertion
Hip and Gluteal Muscles (cont.)
OriginMuscle
Superior gemellus
Inferior gemellus
Quadratus femoris
Piriformis
Action Innervation
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B. Thigh: Anterior Compartment
View Module 16.49 Thigh: Anterior Compartment (formerly 16.29) and Module 16.50 Thigh: Anterior Compartment: Quadriceps (formerly 16.30).The quadriceps group is composed of four muscles: the rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius. They share a common tendon as they cross the knee joint and insert on the tibia. Since these muscles cross the knee on the anterior side, their contraction pulls the tibia upward and extends the knee.
The long sartorius is also found in the anterior compartment, but due to its attachment on the inside of the knee, it causes lateral rotation at the hip.
Module 16.49 Thigh: Anterior Compartment (formerly 16.29)
Vastus lateralis muscle
Vastus medialis muscle
Sartorius muscle
Vastus intermedius muscle
Rectus femoris muscle
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Insertion
Thigh: Anterior Compartment
OriginMuscle
Sartorius
Rectus femoris
Vastus medialis
Vastus lateralis
Vastus intermedius
Action Innervation
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C. Thigh: Medial Compartment
View Module 16.51 Thigh: Medial Compartment and Module 16.52 Medial Compartment: Adductors.These muscles are located deep to the muscles of the anterior compartment and primarily act to adduct the thigh.
Module 16.51 Thigh: Medial Compartment
Adductor longus muscle
Pectineus muscle
Adductor magnus muscle
Adductor brevis muscle
Gracilis muscle
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Insertion
Thigh: Medial Compartment
OriginMuscle
Pectineus
Gracilis
Adductor brevis
Adductor longus
Adductor magnus
Action Innervation
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D. Thigh: Posterior Compartment
View Module 16.53 Thigh: Posterior Compartment (Hamstrings).These muscles, commonly known as the hamstrings, are located on the posterior side of the femur. They cross the knee on the posterior side and cause leg flexion at the knee joint.
Biceps femoris muscle, long head
Semitendinosus muscle
Semimembranosus muscle
Biceps femoris muscle, short head
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Insertion
Thigh: Posterior Compartment
OriginMuscle
Biceps femoris
Semitendinosus
Semimembranosus
Action Innervation
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E. Lower Leg: Anterior Compartment
View Module 16.54 Lower Leg: Anterior Compartment.The muscles of the lower leg are also separated into compartments, each of which serves a similar function. The anterior compartment muscles all cross the ankle joint on the anterior side, and therefore, each causes dorsiflexion of the foot as one of its actions.
To view the extensor hallucis longus more clearly, be sure to hide the tibialis anterior and extensor digitorum longus.
Tibialis anterior muscle
Extensor digitorum longus muscle
Extensor hallucis longus muscle
Fibularis (peroneus) tertius muscle
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Insertion
Lower Leg: Anterior Compartment
OriginMuscle
Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Fibularis (peroneus) tertius
Action Innervation
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F. Lower Leg: Lateral Compartment
View Module 16.55 Lower Leg: Lateral Compartment.These muscles, located on the lateral side of the leg, cause plantarflexion and eversion of the foot.
Insertion
Lower Leg: Lateral Compartment
OriginMuscle
Fibularis (peroneus) longus
Fibularis (peroneus) brevis
Action Innervation
Fibularis (peroneus) longus muscle
Fibularis (peroneus) brevis muscle
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G. Lower Leg: Posterior Compartment
View Module 16.56 Lower Leg: Posterior Compartment (Superficial) and Module 16.57 Lower Leg: Posterior Compartment (Deep).Except for the popliteus, all the posterior compartment muscles of the lower leg cross the ankle joint on the posterior side and are involved in plantarflexion of the foot.
Module 16.56 Lower Leg: Posterior Compartment (Superficial)
Gastrocnemius muscle
Plantaris muscle
Popliteus muscle
Soleus muscle
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Module 16.57 Lower Leg: Posterior Compartment (Deep)
Popliteus muscle
Flexor digitorum longus muscle
Tibialis posterior muscle
Flexor hallucis longus muscle
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Insertion
Lower Leg: Posterior Compartment
OriginMuscle
Gastrocnemius
Soleus
Plantaris
Flexor digitorum longus
Popliteus
Tibialis posterior
Flexor hallucis longus
Action Innervation
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H. Foot
View Module 16.58 Foot: Dorsum, Module 16.59 Foot: Plantar Layer 1, Module 16.60 Foot: Plantar Layer 2, Module 16.61 Foot: Plantar Layer 3, and Module 16.62 Foot: Plantar Layer 4.These muscles are all located within the foot and act to move the toes. Keep your anatomical terminology in mind as you learn these muscles: hallucis refers to the big toe (digit 1), digitorum refers to toes 2-5, and digiti minimi refers specifically to the little toe (digit 5).
Module 16.58 Foot: Dorsum
Extensor hallucis brevis muscle
Extensor digitorum brevis muscle
Dorsal interossei muscles
Quadratus plantae muscle
Abductor digiti minimi muscle
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Module 16.60 Foot: Plantar Layer 2
Quadratus plantae muscle
Flexor hallucis brevis muscle
Lumbricals
Module 16.61 Foot: Plantar Layer 3
Flexor hallucis brevis muscle
Opponens digiti minimi muscle
Flexor digiti minimi brevis muscle
Adductor hallucis muscle
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Module 16.62 Foot: Plantar Layer 4
Plantar interossei muscles
Module 16.62 Foot: Plantar Layer 4
Dorsal interossei muscles
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Insertion
Foot
OriginMuscle
Extensor digitorum brevis
Extensor hallucis brevis
Flexor digitorum brevis
Abductor digiti minimi
Abductor hallucis
Quadratus plantae
Lumbricals
Flexor hallucis brevis
Adductor hallucis
Action Innervation
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Insertion
Foot (cont.)
OriginMuscle Action Innervation
Flexor digiti minimi brevis
Opponens digiti minimi
Dorsal interossei
Plantar interossei
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PUTTING IT ALL TOGETHER
1. Based on what you’ve learned about the muscles in this exercise, what do you think the following terms mean?
a. Brevis –
b. Longus –
c. Lateralis –
d. Medialis –
e. Digitorum –
f. Hallucis –
g. Digiti minimi –
2. Which muscles are used when performing the following actions?
a. Extending the leg to kick a ball
i.
ii.
iii.
iv.
b. Sitting cross-legged
i.
ii.
iii.
iv.
v.
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vi.
vii.
c. Pulling the knees up to the chest, as when jumping into a pool “cannonball” style
i.
ii.
iii.
iv.
v.
d. Standing on tiptoes
i.
ii.
iii.
e. Climbing stairs
i. Raising the body up and lifting a leg:
1.
2.
3.
4.
5.
6.
7.
8.
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i. Stepping up to the next step:
1.
2.
3.
4.
5.
6.
3. Foot drop involves difficulty or inability to lift the front of the foot. It may be due to a variety of factors, including nerve injury. Which nerve would be affected?
4. If someone were to tear his/her Achilles (calcaneal) tendon, what muscle action(s) would be affected?
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Module 16.46 Thigh: Iliopsoas
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Module 16.47 Thigh: Gluteal
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Module 16.48 Thigh: Lateral Rotators (Part 1)
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Module 16.48 Thigh: Lateral Rotators (Part 2)
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Module 16.49 Thigh: Anterior Compartment (formerly 16.29)
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Module 16.51 Thigh: Medial Compartment
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Module 16.53 Thigh: Posterior Compartment (Hamstrings)
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Module 16.54 Lower Leg: Anterior Compartment
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Module 16.55 Lower Leg: Lateral Compartment
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Module 16.56 Lower Leg: Posterior Compartment (Superficial)
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Module 16.57 Lower Leg: Posterior Compartment (Deep)
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Module 16.58 Foot: Dorsum
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Module 16.59 Foot: Plantar Layer 1
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Module 16.60 Foot: Plantar Layer 2
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Module 16.61 Foot: Plantar Layer 3
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Module 16.62 Foot: Plantar Layer 4
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Module 16.62 Foot: Plantar Layer 4