Anatomy 1

Create a sphincter; control material passage through an opening (orbicularis oris)

Run parallel to muscles long axis. Higher endurance. Recuts abdomonis

Fascicles merge toward a common attachment site. Can pull in vertical directions but not as hard as parallel. Pectoralis major

Fascicles organized as if part of a larger thing.

Example of unipennate

Example of bipennate

Example of multipennate

Circular muscle fibers surround orbit. Closes eye

Elevates upper eyelid

Closes mouth puckers lips

Pulls lower lip inferiorly

Pulls corners of mouth inferiorly to frown

Pulls upper lip superiorly

Works with zygomaticus major and minor smiling. Pulls corner of mouth superiorly and laterally

Pulls corner of lip laterally

Protrudes lower lip

Tenses skin of neck and pulls lower lip inferiorly

Compresses cheek against teeth when chewing

Pulls eye medially

Pulls eye laterally

Pulls eye inferiorly and medially

Pulls eye superiorly and medially

Elevates and turns eye laterally

Depresses and turns eye laterally

Elevates ribs during inspiration, expanding cavity.

Deep to external intercostals, fibers at right angles to external intercostals. Depresses ribs forced expiration

Depresses ribs during forced expiration

Fibers directed inferomedially

Fibers project superomedially

Fibers project transversely

Fibers project vertically (enclosed within fibrous sleeve/ rectus sheath)

Deep to pectoralis major. Helps depress and protract scapula ; hunches shoulders

Fan shaped muscle between ribs and scapula. Protracts stabilizes scapula

Extends from clavicle to first rib. Stabilizes and depresses scapula

How many muscles cross the gelnohumeral joint and move the humerus

Prime arm extensor, also adducts and medially rotates arm

Prime arm flexor, adducts and medially rotates arm

Extend and adduct arm

Flexing arm

Prime abductor, medially rotate arm, abduct arm, extend and laterally rotate arm

Flexes and adducts arm

Extends, adducts, medially rotates arm

Medially rotates arm

Abducts arm

Adducts and laterally rotates arm

Flexes and supinates forearm, weak flexor of humerus. Two headed muscle on anterior humerus

Deep to biceps brachii, most powerful flexor to forearm

Located on anterolateral forearm, synergist in elbow flexion

Large three headed muscle on posterior arm, major extensor of forearm, also helps extend humerus

Weak elbows extensor, crosses posteriorlateral region of elbow

Rotate the radius across the ulna to pronate forearm, located in anterior compartment of forearm

Supinated forearm , located in posterior compartment of forearm

Extend the knee or flex the thigh

Adduct the thigh

Abducts the thigh

Flex the knee and extend the thigh

Flex hip joint

Abducts and medially rotates the thigh

Adduct and flex the thigh

Adducts extends and laterally rotates the thigh

Laterally rotates the thigh

Chief extensor of the thigh. Laterally rotates the thigh

Deep to gluteus Maximus abduct and medially rotate the thigh

Group of three muscles. Hamstrings. Extend the muscle also flex the knee

Composite muscle with four heads. Consists of rectus femoris , vastus lareralis, vastus medialis, vastus intermedius

Flexes and laterally rotates thigh; also flexes and medially rotates leg

Flexes the leg (as well as addicting the thigh)