Bio 133 - Lab #9

Front 1

Latissimus dorsi

Back 1

Movement: main function is to adduct and medially rotate the humerus

Front 2

External oblique

Back 2

Movement: helps compress the abdomen and rotates vertebral column

Front 3

Internal oblique

Back 3

Movement: serves to compress the abdomen and rotate the vertebral column

Front 4

Transverse abdominus

Back 4

Movement: serves to compress the abdomen

Front 5

Rectus abdominus

Back 5

Movement: serves to compress the abdomen and flex the vertebral column in an anterior direction

Front 6

Multifidus spinae

Back 6

Movement: functions in arching or extending the back

Front 7

Erector spinae

Back 7

Movement: functions in arching or extending the back as well as in lateral (side-to-side) flexion of the back (2)

Front 8

Pectoantibrachialis

Back 8

not found in humans

Front 9

Pectoralis major

Back 9

smaller than the pectoralis minor in the cat. the opposite is true in humans.
Movement: functions in the adduction and medial rotation of the arm

Front 10

Pectoralis minor

Back 10

Movement: protects the scapula

Front 11

Xiphihumeralis

Back 11

runs from the end of the sternum to the humerus

Front 12

Clavorapezius

Back 12

Movement: elevates and rotates the scapula medially

Front 13

Acromiotrapezius

Back 13

Movement: adduct the scapula

Front 14

Spinotrapezius

Back 14

Movement: depresses and rotates the scapula medially

Front 15

Sternomastoid

Back 15

Movement: flexes the neck laterally and rotates the head

Front 16

Cleidomastoid

Back 16

Movement: flexes the neck laterally and rotates the head

Front 17

Levator scapulae

Back 17

Movement: pulls the scapula cranially

Front 18

Clavodeltoid

Back 18

Movement: protracts the arm

Front 19

Acromialdeltoid

Back 19

Movement: abducts the arm

Front 20

Spinodeltoid

Back 20

Movement: retracts the arm

Front 21

Triceps brachii

Back 21

Movement: extends the antebrachium (forearm)

Front 22

Biceps brachii

Back 22

Movement: flexes the antebrachium (forearm)

Front 23

Brachialis

Back 23

Movement: flexes the antebrachium (forearm) the blue one

Front 24

origin

Back 24

the structure to which the muscle is attached that remains relatively fixed when the muscle contracts

Front 25

insertion

Back 25

the structure to which the muscle is attached that moved when the muscle contracts

Front 26

belly

Back 26

the thick part of the muscle between the insertion and origin

Front 27

tendon

Back 27

cords of fibrous connective tissue by which a muscle is connected to its insertion and origin

Front 28

aponeurosis

Back 28

a broad, flat sheet of fibrous connective tissue by which a muscle is attached to its origin and insertion; these are less common than tendons

Front 29

flexor

Back 29

a muscle which decreases an angle between two structures; or a muscle that bends one skeletal part in relation to another (the biceps of the arm flexes the forearm)

Front 30

extensor

Back 30

increases the angle between two structures; or a muscle that straitens (the triceps extend the forearm)

Front 31

abductor

Back 31

moves part away from the main axis (midline) of the body (the gluteus maximus moves the leg away from the body)

Front 32

adductor

Back 32

moves a part toward the main axis (midline) of the body (the adductor femoris muscle brings the leg toward the body)

Front 33

levator

Back 33

raises a part of the body

Front 34

depressor

Back 34

lowers a part of the body

Front 35

protractor

Back 35

moves a part of the body forward

Front 36

retractor

Back 36

moves a part of the body backward

Front 37

lumbodorsal fascia

Back 37

wide sheet of tough, white connective tissue