Forelimb Lecture #3 Flashcards
Criteria for muscles to be included as intrinsic shoulder muscles?
they cross the shoulder joint - scapula to humerus
What is the action of the supraspinatus? Innervation?
extend and stabilize shoulder
suprascapular nerve
What is the action of the infraspinatous? Innervation?
flex and stabilize the shoulder
suprascapular nerve
What are bursa
Fluid filled sacs that reduces friction between moving parts
What is the action of the deltoid? Innervation?
Flex, abduct and stabilize shoulder
axillary
What is the action of the teres major? Innervation?
flex shoulder
axillary
What is the action of the supscapularis? Innervation?
adduct and extend shoulder
subscapular
What is the action of the coracobrachialis? Innervation?
flex shoulder
musculocutaneous
What is the action of the teres minor?
stablizes and flexes shoulder
what are elbow extensors innverated by and what muscles are included in this group
radial nerve
triceps brachii, tensor fascia antebrachii, anconeous
What is the action of the triceps brachii? Innervation?
extend and stabilize the elbow
radial
What head of the triceps can also act on the shoulder to flex it?
the long head
What is the action of the tensor fascia antebrachii? Innervation?
extends and supports elbow
radial
What is the action of the anconeus? Innervation?
extends and supports elbow (support is the more important function)
radial
what is special about the anconeus in the horse
its fatigue resistant, and when its standing it keeps the elbow straight without using the triceps brachii
what muscles are elbow flexors and what are they innervated by
biceps brachii, brachialis
musculocutaneous
What is the action of the biceps brachii? Innervation?
flex elbow (main) and extend shoulder
musculocutaneous
what is a special part associated with a horse bicep and why
intramuscular tendon that is an energy saving spring
what is the lacertus fibrosus and what species is it in
it is a thick piece of fascia that is part of the stay apparatus. blends the distal biceps brachii to the carpal extensor tendon
horse
What is the action of the brachialis? Innervation?
flex elbow
musculocutaneous
what are the bursae called in horses
bicipital bursa = between the biceps brachii tendon and intermediate tubercle
olecranon bursa = between the triceps brachii tendon (subtendinous) or subcutis (subcutaneous) and olecranon
when are the points that the blood supply in the forelimb changes
axillary then it becomes brachial, and then it becomes median just after the elbow
