Major Skeletal Muscles The muscle name indicates – Location – Size – Action – Shape OR –...
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![Page 1: Major Skeletal Muscles The muscle name indicates – Location – Size – Action – Shape OR – Number of attachments of the muscle.](https://reader035.fdocuments.us/reader035/viewer/2022062714/56649d305503460f94a08e3b/html5/thumbnails/1.jpg)
Major Skeletal Muscles
• The muscle name indicates – Location– Size– Action– Shape
OR– Number of
attachments of the muscle
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Major Skeletal Muscles: The Head
• Sternocleidomastoid – Pulls the head to one
side – Pulls the head to the
chest• Frontalis
– Raises the eyebrows
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Muscles of the Spine
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Major Skeletal Muscles: Upper Extremity
• Pectoralis major – Pulls the arm across the chest
– Rotates and adducts the arms
• Latissimus dorsi – Extends and adducts the arm
and rotates the arm inwardly
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Muscles of the Shoulder
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Muscles of the Shoulder
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Major Skeletal Muscles: Upper Arm (cont.)
• Deltoid– Abducts and extends the
arm at the shoulder
• Subscapularis – Rotates the arm medially
• Infraspinatus – Rotates the arm laterally
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Major Skeletal Muscles: Forearm
• Biceps brachii – Flexes the arm at the elbow – Rotates the hand laterally
• Brachialis – Flexes the arm at the elbow
• Brachioradialis – Flexes the forearm at the
elbow
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Major Skeletal Muscles: Forearm (cont.)
• Triceps brachii – Extends the arm at the
elbow
• Supinator – Rotates the forearm laterally
(supination)
• Pronator teres – Rotates the forearm
medially (pronation)
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Muscles that Move the Arm
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Muscles that Move the Arm
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Muscles That Move the Forearm and Wrist
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Major Skeletal Muscles: Wrist, Hand, and Fingers
• Flexor carpi radialis and flexor carpi ulnaris – Flex and abduct the wrist
• Palmaris longus – Flexes the wrist
• Flexor digitorum profundus – Flexes the distal joints of the
fingers, but not the thumb
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• Extensor carpi radialis longus and brevis – Extend the wrist and abduct the hand
• Extensor carpi ulnaris – Extends the wrist
• Extensor digitorum – Extends the fingers, but not the thumb
Major Skeletal Muscles: Wrist, Hand, and Fingers (cont.)
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Major Skeletal Muscles: Respiratory
• Diaphragm – Separates the thoracic
cavity from the abdominal cavity
– Its contraction causes inspiration
• External and internal intercostals – Expand and lower the ribs
during breathing
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Major Skeletal Muscles: Abdominal
• External and internal obliques – Compress the abdominal wall
• Transverse abdominis – Also compresses the abdominal wall
• Rectus abdominis– Flexes the vertebral column– Compresses the abdominal wall
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•Oblique and Rectus Muscles and the
Diaphragm
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Major Skeletal Muscles: Pectoral Girdle
• Trapezius – Raises the arms – Pulls the shoulders downward
• Pectoralis minor – Pulls the scapula downward– Raises the ribs
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Major Skeletal Muscles: Leg
• Psoas major and iliacus – Flexes the thigh
• Gluteus maximus – Extends the thigh
• Gluteus medius and minimus – Abduct the thighs – Rotate them medially
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Major Skeletal Muscles: Leg (cont.)
• Adductor longus and magnus – Adduct the thighs – Rotate them laterally
• Biceps femoris, semitendinosus, and semimembranosus – Known as the hamstring group– Flex the leg at the knee – Extend the leg at the thigh
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• Rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius – Extend the leg at the knee
• Sartorius – Flexes the leg at the knee and
thigh – Abducts the thigh, rotating the
thigh laterally but rotating the lower leg medially
Major Skeletal Muscles: Leg (cont.)
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Muscles That Move the Thigh
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Muscles That Move the Thigh
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Figure 7-21
Muscles That Move the Leg
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Major Skeletal Muscles: Ankle, Foot, and Toes
• Tibialis anterior – Inverts the foot and point the
foot up (dorsiflexion)
• Extensor digitorum longus – Extends the toes and point the
foot up
• Gastrocnemius– Flexes the foot and flexes the leg
at the knee
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• Soleus – Flexes the foot
• Flexor digitorum longus– Flexes the foot and
toes
Major Skeletal Muscles: Ankle, Foot, and Toes (cont.)
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Muscles That Move the Foot and Toes
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Muscles That Move the Foot and Toes
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Muscles That Move the Foot and Toes
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Muscles That Move the Foot and Toes
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