Muscles

Question 1

Biceps femoris

Answer 1

O: ischiatic tuberosity and sacrotuberous ligament
I: fascia lata + crural fascia; cranial tibia and tuber calcanei
A: extend hip, flex stifle, extend hock
N: sciatic n.

Question 2

Biceps brachii

Answer 2

O: supraglenoid tubercle of scapula
I: ulnar and radial tuberosities
A: flex elbow, extend shoulder
N: musculocutaneous n.

Question 3

Triceps brachii

Answer 3

O: long head- caudal border of the scapula; lateral head- tricipital line of humerus; accessory head- humerus neck; medial head- lesser tubercle
I: olecranon tuber
A: extend elbow; long head- shoulder flexion
N: radial n.

Question 4

Quadriceps

Answer 4

O: proximal cranial femur, except rectus - ilium
I: tibial tuberosity via patellar ligament
A: extend stifle; rectus also flexes hip
N: femoral n.

Question 5

Sartorius

Answer 5

O: cranial hd- iliac crest and TL fascia; caudal hd- ventral iliac spine and ventral ilium
I: cranial hd- patella; caudal hd- cranial tibia
A: flex hip, cranial- extends stifle; caudal- flex stifle
N: femoral n.

Question 6

Gastrocnemius

Answer 6

O: medial and lateral supracondylar tuberosities of femur
I: proximal dorsal surface of tuber calcanei
A: flex stifle, extend tarsus
N: tibial n.

Question 7

Cranial tibial

Answer 7

O: extensor groove of tibia; and lateral cranial tibia border
I: plantar surface of base of MT 1 + 2
A: flex tarsocrural joint; rotate paw laterally
N: fibular n.

Question 8

Iliopsoas

Answer 8

O: psoas major - lumbar vertebrae, iliacus - cranioventral ilium
I: lesser trochanter
A: flex hip (and lumbar vertebrae)
N: ventral branches of lumbar spinal nn., femoral n.

Question 9

Deltoideus

Answer 9

O: spine + acromion process of scapula
I: deltoid tuberosity
A: flex shoulder
I: axillary n.

Question 10

Pectorals

Answer 10

O: sup - first 2 sternebrae +/- third, fibrous raphe b/t adjacent muscles; deep - ventral part of sternum, deep abdominal fascia in region of xiphoid cartilage
I: sup - greater tubercle of humerus; deep - lesser tubercle
A: sup - adduct limb when NWB or prevent limb from being abducted when WB; deep - pull trunk cranially and extend shoulder when WB, draw limb caudally and flex shoulder when NWB
N: sup - cranial pectoral nn. (C7, C8); deep - caudal pectoral nn (C8, T1)

Question 11

Gracilis

Answer 11

O: pelvic symphysis via symphyseal tendon
I: cranial tibial border and tuber calcanei
A: adduct limb, flex stifle, extend hip and hock
N: obturator n.

Question 12

Pectineus

Answer 12

O: iliopubic eminence and pubic tubercle via republic tendon
I: caudal rough face of femur
A: adduct limb
N: obturator n.