Muscular Anatomy

Color and label your diagrams.You do NOT have to write down the “Other Notes.” These are just little

tidbits of information you might find interesting.

Facial Muscles

Frontalis--Eyebrow elevation

Orbicularis Oculi

--Closes eye

Temporalis

Other Notes:• Synergist

Closes jaw

Masseter

Other Notes:• Sometimes

considered the strongest muscle

• Much larger on animals (dogs and cats) since they use their mouths more.

• If your dog or cat has something in its mouth push on the masseter on both sides and they usually will release it.

--Closes jaw

Zygomaticus--Raises corner of mouth--“smile” muscle

Buccinator--Sucks in cheeks--“Trumpeters” muscle

Orbicularis Oris--Closes and protrudes lips--“Kissing” muscle

Trapezius

Other Notes:• Broad superficial posterior

muscle• “Shoulder rub” muscle• Common muscle for neck

“kinks” or sleeping wrong

--Shoulder elevation--Neck Extension

Other Notes:• Longest muscle name• Named for attachment points

– Sternum– Clavicle– Mastoid Process

Sternocleidomastoid--Neck flexion and rotation

Frontalis

Orbicularis OculiTemporalis

Masseter

Zygomaticus

Buccinator

Orbicularis Oris Trapezius

Sternocleidomastoid

ANTERIOR TRUNK MUSCLES

SternocleidomastoidNeck flexion and rotation

TrapeziusShoulder elevation

Neck Extension

DeltoidShoulder abduction

Other Notes:• Named for the shape of

the muscle • An upside-down

triangle• Delta-greek letter (∆)

Pectoralis MajorShoulder adduction

Other Notes:• Tendon is the

front of the armpit

External ObliqueVertebral column flexion and rotation

Rectus AbdominisVertebral column flexion

Sternocleidomastoid

Trapezius

Deltoid Pectoralis Major

External Oblique Rectus Abdominis

ANTERIOR TRUNK MUSCLES(Not Pictured but required for you to know)

• External Intercostals– Located in between

each of the ribs– Action: Breathing

• Internal Intercostals– Located in between

each of the ribs underneath the external intercostals

– Action: Breathing

• Internal Oblique– Located under the external

oblique– Fibers go the opposite

direction– Action: forms the abdominal

girdle

• Transverse abdominis– Located under the internal

oblique– Fiber direction is transverse– Action: Forms the abdominal

wall

I will show you pictures of these

Monday!

Posterior Trunk Muscles

TrapeziusShoulder elevation

Neck Extension

Deltoid--Shoulder abduction

Latissimus Dorsi--Shoulder extension and adductionOther Notes:• Tendon is the back of

the armpit

Erector Spinae--Back extension

Erector Spinae

Latissimus Dorsi

Deltoid

Trapezius

Arm Muscles

• Important!!! (Write this down)

– Wrist Flexors• Anterior side of forearm

– Wrist Extensors• Posterior side of forearm

See the “delta” (triangle)?

Deltoid--Shoulder abduction

Biceps brachii--Elbow flexion--Forearm supination

Other Notes:• It is the biceps brachii

• Not the biceps• You also have a biceps femoris

• Where do you think it is located?• Biceps brachii is located on the

anterior of the humerus

Triceps brachii--Elbow extension

Other Notes:• Triceps brachii is

located on the posterior humerus

Extensor digitorum--Extends fingers

Extensor digitorum

Triceps brachiiBiceps brachii

Deltoid

Arm Muscles(Not pictured but required for you to know)

• Extensor carpi radialis– Location: Posterior

forearm on lateral side (radius)

– Action: Wrist extension

• Flexor carpi radialis– Location: Anterior

forearm on lateral side– Action: Wrist flexion

• Flexor digitorum superficialis– Location: Anterior forearm;

superficial muscle– Action: Finger flexion

Posterior Anterior

Gluteus Medius--Hip Abduction & Internal Rotation

Gluteus Maximus--Hip extension

Hamstring--Hip extension--Knee flexion

Posterior

Gastrocnemius--Ankle plantar flexion--Knee flexion

Soleus--Ankle plantar flexion

Adductor Group--Hip

Adduction

Quadriceps--Hip flexion--Knee extension

Other Notes:• 4 muscles• One muscle (vastus

intermedius) is hidden in the diagram under the other 3 muscles

Sartorius-- Hip and knee Flexion-- Hip Abduction-- Hip External Rotation

Other Notes:• F.AB.ER. (crosses your

legs)

• Longest muscle in the body

Tibialis Anterior--Ankle dorsiflexion and inversion

Fibularis Muscles--Ankle plantar flexion and eversion

Gluteus Medius

Gluteus Maximus

Hamstring

Gastrocnemius

Soleus

AdductorGroup

Quadriceps

Sartorius

Tibialis Anterior

Fibularis Muscles

Not PicturedIliopsoas• Location: Very deep in

the pelvis• Action: Hip flexion