Forelimb muscles

Question 1

Name the functions of the ventral serrate muscle:

Answer 1

• Sling support suspending thorax between two limbs
• Cervical part lifts neck (bilateral) + moves neck laterally (unilateral)
• Manipulates position of scapula thus can advance or retract the limb
• Small role forced expiration

Question 2

Name the functions of the rhomboid muscle:

Answer 2

• Draws scapula against the trunk
• Rotates scapula to retract limb
• Elevate scapula

Question 3

Name the functions of the deep pectoral muscles:

Answer 3

• Powerfully retracts the advanced limb
• Extends the shoulder joint
• Assists in suspension of the thorax

Question 4

Name the functions of the superficial pectoral muscles:

Answer 4

• Adduct the limb
• Assist in the suspension of the trunk
• Protraction and retraction of the limb, depending on relative position

Question 5

Name the functions of the omotransverse muscles:

Answer 5

Action- advances (protracts) the limb

Question 6

Name the nerve that innervates the omotransverse muscle:

Answer 6

Innervated by the accessory nerve

Question 7

Name the actions of the trapezius:

Answer 7

elevate the scapula (when both parts contract together), swing the limb forward (ie. protraction)

Question 8

Name the nerve innervation of the trapezius:

Answer 8

accessory nerve

Question 9

Name the functions of the lat dorsi:

Answer 9

pull trunk forward when foot is fixed forward, retracts the limb (and flexes shoulder joint) if limb is free

Question 10

Name the function of the brachiocephalicus muscle:

Answer 10

• Advances (protracts) the free limb
• • or – extends the should joint
• Fixes and depresses the neck (bilateral)
• Draws head and neck laterally (unilateral)

Question 11

What is the function of the supraspinatus:

Answer 11

• Fixator- acts as cranial “collateral’ ligament

* Extensor- resists flexion under load

Question 12

What is the function of the infraspinatus:

Answer 12

• Fixator- acts like a laterall collateral ligament
• Outward rotation of the humerus
• Weak abductor of humerus
• Flex or extend the shoulder joint

Question 13

What nerve innervates both the supraspinatus and infraspinatus muscles?

Answer 13

suprascapular nerve

Question 14

Name the functions of the subscapularis:

Answer 14

• fixator- acts as a medial collateral ligament to shoulder
• adducts the shoulder
• Mainly inserts cranial to axis of rotation

Question 15

What nerve innervates the subscapularis?

Answer 15

o Subscapular nerve and auxiliary nerve

Question 16

What nerve innervated the deltoid muscle?

Answer 16

• axillary nerve

Question 17

What nerve innervates the biceps brachii?

Answer 17

• axillary nerve

Question 18

What is the function of the biceps brachii?

Answer 18

• flexes elbow joint, extends the shoulder (resists flexion)

Question 19

What is the function of the brachialis?

Answer 19

Serves to flex the elbow

Question 20

What is the functions of the triceps?

Answer 20

• extends the shoulder joint

- flexes the shoulder joint

Question 21

What is the nerve innervation of the triceps?

Answer 21

Innervated by the radial nerve