Intrinisic Shoudler Muscles Flashcards
Where do the intrinsic muscles of the shoulder originate from?
The scapula and/or clavicle
Where do the intrinsic muscles of the shoulder attach to?
The humerus
What are the intrinsic muscles of the shoulder?
Deltoid Teres major Supraspinatus Infraspinatus Subscapularis Teres minor
What muscles are considered to be part of the rotator cuff group?
Supraspinatus
Infraspinatus
Subscapularis
Teres minor
What shape is the deltoid muscle?
Triangle
What can the deltoid muscle be divided into?
Anterior (clavicular), middle (acromial) and posterior (spinal) parts
What is the innervation of the deltoid?
Axillary nerve (C5, C6)
What is the arterial supply of the deltoid?
Posterior circumflex humeral artery
What is the action of the clavicular part of the deltoid?
Flexes and medially rotates arm
What is the action of the acromial part of the deltoid?
Abducts arm- takes over from supraspinatus, which abducts the first 15º
What is the action of the spinal part of the deltoid?
It extends and laterally rotates the arm
What does the teres major form?
The inferior border of the quadrangular space
What is the quadrangular space?
The ‘gap’ that the axillary nerve and posterior circumflex humeral artery pass through to reach the posterior scapula region
What is the innervation of the teres major?
Lower subscapular nerve (C5, C6)
What is the arterial supply of the teres major?
Circumflex scapular artery
Subscapular artery