Rotator cuff injury Flashcards
What muscles make up the rotator cuff?
Supraspinatus
Infraspinatus
Subscapualris
Teres minor
Why are the rotator cuff muscles important?
For shoulder movement and stability of the shoulder joint.
What is the origin, insertion/attachment and function of the Supraspinatus muscle?
Supraspinous fossa of scapula
Greater tubercle of humerus
Assists deltoid in abducting the shoulder joint
What is the origin, insertion/attachment and function of the Infraspinatus muscle?
InfraspinOUS fossa of scapula
Greater tubercle of humerus
Laterally rotates arm at shoulder joint
what muscle initiates abduction of the shoulder?
Deltoid
What is the origin, insertion/attachment and function of the teres minor muscle?
Inferior lateral border of the scapula
Greater tubercle of humerus
lateral rotation of arm and extends arm at shoulder joint
What is the origin, insertion/attachment and function of the subscapularis muscle?
Subscapular fossa of the scapula
Lesser tubercle of humerus
Internal rotation of shoulder joint
which rotator cuff muscle is most anterior?
Subscapularis
What is a tendon?
A band of dense, fibrous connective tissue that connects skeletal muscles to bone.
What is the function of tendons?
Transmits mechanical force of muscle contraction to the bones
What are the 2 main structural divisions/components of tendons and what percentages do the make up?
Cellular component: 20%
Extracellular component: 80%
what do tendons attach to ?
fascia of muscle and periosteum of bones
what makes up the cellular part of tendons? what is their function?What shape are they?
tenocytes/fibroblasts: synthesise ECM
They are spindle shaped
what are tenoblasts?
immature tendon cells which turn into tenocytes
What are the divisions of the EC component of tendons?
70% = water 30% = type 1 and 3 collagen, ground substance, elastin