Stay Mechanism

Question 1

What are the components of the stay mechanism of the thoracic limb?

Answer 1

Serratus Ventralis
Biceps Brachii Tendon
Triceps Brachii
Lacterus Fibrosis
Extensor Carpi Radialis
Superficial Digital Flexor (includes check ligament)
Deep Digital Flexor (includes check ligament)
Common digital flexor
Sesamoid ligaments
Sesamoid bones
Interssoseaus / Suspensory Ligament

Question 2

Interosseous Medius / Suspensory Ligament

Answer 2

Attaches to the distal row of Carpal Bones. Runs along palmar surface of the metacarpal bone. Bifurcates at the metacarpal phalangeal joint to connect to each sesamoid bone. Continues distally to join the Common Digital Extensor.

Question 3

Collateral Sesamoid Ligament

Answer 3

Connects the sesamoids to the metacarpus and proximal phalanx

Question 4

Palmar Ligament

Answer 4

Connects the sesamoids together

Question 5

Distal Sesamoid Ligaments

Answer 5

Connects the sesamoids to the proximal and middle phalange. Allows fetlock and pastern extension without muscle involvement

Question 6

Common Digital Extensor

Answer 6

Allows resistance of pastern and coffin bone flexion without muscle involvment

Question 7

Serratus Ventralis

Answer 7

Supports most of the body weight and suspends body when muscles relax

Question 8

Biceps Brachii

Answer 8

Allows shoulder to stay extended without contracting the biceps and locks the shoulder joint. Allows relaxation without collapsing the shoulder, elbow and carpal joints.

Question 9

Triceps

Answer 9

Keeps the elbow extended

Question 10

Superficial Digital Flexor and Proximal Check Ligament (Accessory)

Answer 10

Help prevent extension of the carpals and fetlock

Question 11

Deep Digital Flexor and Distal Check Ligament

Answer 11

Help prevent flexion of the car