Labs 9, 10, & 11 Muscular System

Action: elevates the mandible to close the mouth when chewing

Superficial pectoral action: adducts thoracic limb

Deep pectoral action: adducts and pulls limb caudally

Action: elevates and abducts forelimb

Action: extends vertebral column

Next card for drawing of both →

Biceps action: flexes elbow/extends shoulder

Triceps action: extends elbow/ flexes shoulder

(Cranial Aspect of Limb)

1. Extensor carpi radials (midline): extends hands

2. Common digital extensor (midlineish; lateral): extends digits 2 & 5

3. Lateral digital extensor (more lateral to previous): extends digits 2 & 5

4. Extensor carpi ulnaris (most lateral to previous; near wrist): extends digit 5

(Caudal Aspect of Limb)

1. Flexor Carpi Radialis (medial): flexes digits 2 & 3

2. Superficial Digital Flexor (more midline to previous): flexes digits 2 & 5

3. Flexor Carpi Ulnaris (lateral; near wrist): flexes hand

4. Deep Digital Flexor (deep midline): flexes carpus & digits

Action: draws limb caudally; flexes shoulder joint

External intercostals action: elevate ribs to expand the chest for inhalation

Internal intercostals action: pull ribs down and inward to help with forced exhalation

External abdominal oblique action: constricts abdomen

Internal abdominal oblique action: compresses abdomen

Transverse abdominis action: constricts abdomen

Rectus abdominis action: compresses abdomen

Biceps femoris action (lateral): abducts the thigh/ flexes the leg

Semitendinosus action (lateral): flexes the leg

Semimembranosus action (medial): extends thigh

Action: extends stifle/ flexes hip

Action: extends tarsus/ flexes stifle

Pectineus action: adducts limb; extends thigh

Adductor action: adducts limb; extends thigh

Contracts and flattens during inhalation

Sartorius muscle action: flexes hip/extends stifle

Gracilis muscle action: adducts limb/ flexes stifle/ extends hip and hock