Changes

'''''Supraspinatus '''''

'''''Supraspinatus '''''

:'''Innervation''':Suprascapular n. of the brachial plexus

:'''Innervation''':Suprascapular n. of the brachial plexus

:'''Origin''': Supraspinous fossa of the [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Origin''': Supraspinous fossa of the [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Insertion''': Lesser and greater tubercles of the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Insertion''': Lesser and greater tubercles of the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Action''': Extends and braces the shoulder

:'''Action''': Extends and braces the shoulder

'''''Infraspinatus'''''

'''''Infraspinatus'''''

:'''Innervation''':Suprascapular n. of the brachial plexus

:'''Innervation''':Suprascapular n. of the brachial plexus

:'''Origin''': Supraspinatous fossa and spine of the [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Origin''': Supraspinatous fossa and spine of the [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Insertion''': Tendon of insertion bifurcates into a deep part and a superficial part.

:'''Insertion''': Tendon of insertion bifurcates into a deep part and a superficial part.

:: Deep - Greater tubercle of the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]  

:: Deep - Greater tubercle of the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]  

:: Superficial - Lateral [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]], distal to the greater tubercle

:: Superficial - Lateral [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]], distal to the greater tubercle

:'''Action''': Brace the shoulder, supporting flexion or extension.  

:'''Action''': Brace the shoulder, supporting flexion or extension.  

:'''Clinical significance''': The bursa between the superficial tendon of the infraspinatus, and the lateral tubercle of the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]] can be the site of inflammation (bursitis).

:'''Clinical significance''': The bursa between the superficial tendon of the infraspinatus, and the lateral tubercle of the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]] can be the site of inflammation (bursitis).

=='''Medial'''==

=='''Medial'''==

'''''Supscapularis'''''

'''''Supscapularis'''''

:'''Innervation''': Subscapular n. from the brachial plexus

:'''Innervation''': Subscapular n. from the brachial plexus

:'''Origin''': Deep surface of the [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Origin''': Deep surface of the [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Insertion''': Lesser tubercle of the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Insertion''': Lesser tubercle of the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Action''': Braces medial shoulder joint. Primarily acts as an extensor of the shoulder, but can contribute to maintaining flecion.  

:'''Action''': Braces medial shoulder joint. Primarily acts as an extensor of the shoulder, but can contribute to maintaining flecion.  

'''''Coracobrachialis'''''

'''''Coracobrachialis'''''

:'''Innervation''': Musculocutaneous n. of the brachial plexus

:'''Innervation''': Musculocutaneous n. of the brachial plexus

:'''Origin''': Coracoid process of [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Origin''': Coracoid process of [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Insertion''': Proximal shaft of the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Insertion''': Proximal shaft of the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Action''': Fixator

:'''Action''': Fixator

'''''Deltoid'''''

'''''Deltoid'''''

:'''Innervation''': Axillary n. of the brachial plexus

:'''Innervation''': Axillary n. of the brachial plexus

:'''Origin''': Caudal border and spine of the [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]]. One head in the horse, compared with two in species with an acromion (site of second origin.

:'''Origin''': Caudal border and spine of the [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]]. One head in the horse, compared with two in species with an acromion (site of second origin.

:'''Insertion''': Deltoid tuberosity of [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Insertion''': Deltoid tuberosity of [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Action''': Flexes shoulder

:'''Action''': Flexes shoulder

:In the horse, the aponeurosis of the deltoid is partially fused to the ''infraspinatus''.

:In the horse, the aponeurosis of 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 [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Origin''': Dorsal part of the caudal [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]]

:'''Insertion''': Teres major tuberosity midway down the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Insertion''': Teres major tuberosity midway down the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Action''': Flexes the shoulder, supports adduction.

:'''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 [[Bones and Cartilages - Horse Anatomy#Scapula|scapula]], deep to the deltoid

:'''Origin''': Distal third of [[Limb Bones and Cartilages - Horse Anatomy#Scapula|scapula]], deep to the deltoid

:'''Insertion''': Teres minor tuberosity midway down the [[Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Insertion''': Teres minor tuberosity midway down the [[Limb Bones and Cartilages - Horse Anatomy#Humerus|humerus]]

:'''Action''': Flexes the shoulder

:'''Action''': Flexes the shoulder