Muscles of the Neck Flashcards
Brachiocephalicus functions to (2)
Pull foreleg forward when head and neck are fixed
Pull head down and back when foreleg fixed (stance phase)
The brachiocephalicus forms the upper contour of the
Jugular groove
Must stretch a horse’s neck before riding
Omotransversarius functions to…
Bring the leg forward
Both brachio and omo turn the head
Laterally
The counterbalance to omo and brachio is
Nuchal ligament and its laminae
Function of the Latissimus dorsi and teres major?
To draw the forelimb backward, flexing the shoulder joint at the same time
L. dorsi connects to teres major connects to what bone?
Humerus
Why should you saddle horses only with well-fitting saddles?
Forces that converge on the shoulder are enormous
Name muscles that move forelimb forward (BOSBBECTSS)
Brachiocephalicus Omotransversarius Sternomandibularis Biceps brachii Brachialis Ext. carpi radialis Common and Lateral digital extensor Subclavicus Supraspinatus Thoracic portion of trapezius
The sternomandibularis helps the horse…
Lower his head
Muscles that bring the leg forward tend to stay on…
LATERAL side and front side of leg
The trapezius muscle (both portions) contributes to the…
Pendulum swing of the foreleg
Name muscles that move forelimb backward (8)
Latissimus dorsi Teres major Subscapularis Cervical portion of trapezius Rhomboideus Long and lateral head of triceps brachii Flexor carpi radialis and ulnaris Deep digital and superficial digital flexor
Muscles that move the foreleg backward tend to stay on…
MEDIAL side and caudal side of leg
The rhomboideus functions to
Pull the scapula forward (to draw limb backwards)
The serratus ventralis function to
Bring the horse up to go onto the next stride
Serratus ventralis is custom-made to… (What effect is this?)
Elasticize the strides as horse’s limbs hit the ground/Spreads force (Trampoline effect)
Serratus ventralis helps to provide a…
Springboard from which to launch the stride into the next phase
Serratus ventralis muscles also function to
Brace the chest for take-off
Pectoral muscles function to
Cushion the chest on impact
In horses that have lost suppleness in their back or neck muscles, the deep pectoral muscle becomes…
Deep and painful. Such horses often resent being girthed up
Muscles that help to suspend the forelimb (3)
Serratus ventralis
Pectoral muscles
Subclavicus
Pulling the limb backwards is called
Retraction
Drawing the limb forwards is called
Protraction
