Lecture 19 - Thoracic Limb 4

Question 1

Describe the anatomy of “sweeny” and how it affects the gait

Answer 1

A. atrophy of the supraspinatus and infraspinatus

B. appears to “pop” shoulder out of place while walking

Question 2

Name the large bursa associated with the biceps brachii m.

Answer 2

intertubercular/bicipital bursa

Question 3

Describe the biceps brachii and its lacertus fibrosis. what actions does this muscle have?

Answer 3

Biceps brachii originates at the supraglenoid tubercle and ends in two tendons, the longest of which is lacertus fibrosis.

muscle is a flexor of the elbow but contributes to the stay apparatus of TL

Question 4

Explain the important relationship between the triceps brachii m., radial n. , and tuber olecranon of the ulna

Answer 4

all triceps heads insert on the olecranon and are innervated by the radial nerve

Question 5

What are the 3 reasons for a dropped elbow?

Answer 5

1. olecranon fracture
2. triceps myopathy
3. radial nerve injury

Question 6

What is a “capped” elbow?

Answer 6

inflammation of the SQ olecranon bursa

Question 7

What bursa communicates with the elbow

Answer 7

ulnaris lateralis bursa

Question 8

Where does OCD of the pig occur? describe its location

Answer 8

trochlea of humeral condyle

Question 9

What is the action of the antebrachial muscle groups? What is unusual about the ulnaris lateralis?

Answer 9

extensors - common digital extensor
flexors - superficial digital flexor, deep digital flexor
pronate - pronator teres
supinate

ulnaris lateralis acts as a flexor but has extensor attachments

Question 10

Define the accessory (check) ligaments of the SDF and DDF, their attachments, and their functions

Answer 10

proximal check -
superficial digital flexor - flex digits
distal check -
Deep digital flexor - flex digits

Question 11

What ligaments may be transected to treat flexural deformities?

Answer 11

inferior check ligament
superior check ligament

Question 12

What is club foot?

Answer 12

distal interphalangeal hyperflexion

Question 13

Recall the carpal joints

Answer 13

antebrachiocarpal
intercarpal
carpometacarpal

Question 14

Describe the carpal sheath and carpal canal (boundaries too!). What structures pass through?

Answer 14

a. carpal sheath - synovial structure; lower 1/3 radius to upper 1/3 metacarpus

b. carpal canal - space defined by carpal flexor retinaculum, accessory carpal bone, palmar carpal ligament

c. superficial digital flexor and deep digital flexors pass through; medial palmar n. and v.

Question 15

What is the anatomy of “capped knee”? What else could cause swelling in that location

Answer 15

A. acquired SQ bursa due to repetitive trauma at the carpus

B. extensor tendon sheath; carpal joint sacs

Question 16

where do we inject the carpal joints? Which joints do we inject?

Answer 16

A. at the palpable extensor tendons

B. antebrachial and metacarpal joints

Question 17

T/F: injections to the intercarpal and carpometacarpal joints can migrate to each other

Answer 17

True