Lecture 15 10/23/23 Flashcards
What is a plexus?
where nerves come together and form new nerves
Which nerves make up the brachial plexus?
-C6
-C7
-C8
-T1
-T2
Which nerves of the brachial plexus form the radial nerve?
-C7
-C8
-T1
-T2
Which nerves make up the lumbosacral plexus?
-L4
-L5
-L6
-L7
-S1
-S2
-S3
Which nerves of the lumbosacral plexus form the sciatic nerve?
-L6
-L7
-S1
-S2
Which muscles are innervated by the suprascapular n.?
-supraspinatus
-infraspinatus
What is shoulder sweeney?
-result of suprascapular n. damage
-supraspinatus and infraspinatus atrophy
-spine of scapula shows through skin
Which muscles are innervated by the musculocutaneous n.?
cranial mm. of the brachium
Which action is associated with the musculocutaneous n.?
flexion of cubital j.
Which muscles are innervated by the axillary n.?
lateral mm. of the shoulder
Which action is associated with the axillary n.?
flexion of humeral j.
Which muscles are innervated by the radial n.?
-caudal mm. of brachium
-craniolateral mm. of antebrachium
Which actions are associated with the radial n.?
-extension of cubital j.
-extension of carpal j.
-extension of digital j.
What is the overall function of the radial n.?
allows the animal to bear weight on the forelimb
What is seen with high radial paralysis?
-dog on 3 legs
-passive flexion of cubital, carpal, and digital joints
What is seen with low radial paralysis?
-paw flip
-passive flexion of carpal and digital joints
Which muscles are innervated by the medial and ulnar nerves?
caudomedial mm. of antebrachium
Which actions are associated with the medial and ulnar nerves?
-flexion of carpal joints
-flexion of digital joints
What is the cutaneous branch of the musculocutaneous n.?
medial cutaneous antebrachial n.
What is the cutaneous branch of the axillary n.?
craniolateral cutaneous brachial n.
What is the cutaneous branch of the radial n.?
lateral cutaneous antebrachial n.
What is the cutaneous branch of the ulnar n.?
caudal cutaneous antebrachial n.
What does the cutaneous branch of the median n. innervate?
palmar paw
Where would you perform a sensory test for the radial n.?
dorsal paw
Where would you perform a sensory test for the median n.?
center of palmar paw
Where would you perform a sensory test for the ulnar n.?
5th digit
Which arteries provide the flow to the front limb?
-subclavian a.
-axillary a.
-brachial a.
-median a.
Where does the subclavian a. become the axillary a.?
at the first rib
Where does the axillary a. become the brachial a.?
between the circumflex humoral a. and the deep brachial a.
Where does the brachial a. become the median a.?
after the common interosseous a.
Where does the cephalic v. drain into?
external jugular v.
Which region of the body does the cephalic v. drain?
ventral paw (distally)
Where does the axillobrachial v. drain into?
main venous return
Where does the omobrachial v. drain into?
external jugular v.
Where does the median cubital v. drain into?
main venous return
Which region of the body does the accessory cephalic vein drain?
dorsal paw
