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Limb Muscles - Horse Anatomy (view source)
Revision as of 13:15, 15 October 2012
, 13:15, 15 October 2012→Caudal (Flexors)
====='''Caudal (Flexors)'''=====
====='''Caudal (Flexors)'''=====
'''''Deltoids'''''
'''''Deltoid'''''
:'''Innervation''': Axillary n. of the brachial plexus
:'''Innervation''': Axillary n. of the brachial plexus
:'''Origin''': Caudal border and spine of the scapula. One head in the horse and two in species with an acromion. (site of second origin)
:'''Origin''': Caudal border and spine of the scapula. One head in the horse, compared with two in species with an acromion (site of second origin.
:'''Insertion''': Deltoid tuberosity on the humerus
:'''Insertion''': Deltoid tuberosity of humerus
:'''Action''': Flexes shoulder
In the horse, the aponeurosis if the deltoid is partially fused to the infraspinatus.
'''''Teres Major'''''
'''''Teres Major'''''
:'''Innervation''': Axillary n. of the brachial plexus
:'''Innervation''': Axillary n. of the brachial plexus
:'''Origin''': Dorsal part of the caudal scapula
:'''Origin''': Dorsal part of the caudal scapula
:'''Insertion''': Teres tuberosity midway down the humerus
:'''Insertion''': Teres major tuberosity midway down the humerus
:'''Action''': Flexes the shoulder, supports adduction.
'''''Teres Minor'''''
'''''Teres Minor'''''
:'''Innervation''': Axillary n. of the brachial plexus
:'''Innervation''': Axillary n. of the brachial plexus
:'''Origin''': Distal third of scapula, deep to the deltoid
:'''Insertion''': Teres minor tuberosity midway down the humerus
:'''Action''': Flexes the shoulder
NB// There are no defined extensors of the shoulder. Those involved (brachiocephalic m., biceps brachii, supraspinatus, and ascending pectorals) have other, more primary roles.
NB// There are no defined extensors of the shoulder. Those involved (brachiocephalic m., biceps brachii, supraspinatus, and ascending pectorals) have other, more primary roles.