Back - Dr. Johnson Flashcards
Focus on ligaments between sternum and clavicle
What structures form the sternoclavicular joint?
Costoclavicular, interclavicular, and anterior sternoclavicular ligaments, articular disc, and synchondrosis.
Provides clavicle stability for shoulder movement.
Stabilizes the glenohumeral joint
What ligaments support the glenohumeral joint?
Superior, middle, and inferior glenohumeral ligaments, coracohumeral, and transverse humeral ligaments.
Together, these prevent shoulder dislocation.
AC and surrounding ligaments
Which ligaments are involved in acromioclavicular joint stability?
Acromioclavicular, coracoacromial, trapezoid, and conoid ligaments.
These strengthen the clavicle-to-scapula attachment.
Axio-appendicular muscles for shoulder movement.
Which muscles are classified as extrinsic shoulder muscles?
Trapezius, latissimus dorsi, rhomboid major and minor, levator scapulae.
Connects back muscles to upper limb.
Mnemonic SITS
List the rotator cuff muscles.
Supraspinatus, infraspinatus, teres minor, and subscapularis.
Rotator cuff stabilizes humeral head in glenoid cavity.
What’s the role of supraspinatus?
First muscle in shoulder abduction
Assists in shoulder abduction and stabilizes humeral head.
Important for initiating shoulder movement.
Attaches from infraspinous fossa
Where does infraspinatus attach and what’s its function?
From infraspinous fossa to greater tubercle; laterally rotates the arm.
Works with teres minor for shoulder lateral rotation.
Innervated by axillary nerve
Identify the innervation for teres minor.
Axillary nerve (C5, C6).
Axillary nerve injury can impact teres minor and deltoid function.
Only rotator cuff muscle for internal rotation
Define the primary function of subscapularis.
Medially rotates the arm and stabilizes the humeral head.
Only rotator cuff muscle responsible for internal rotation.
Key bursae for reducing friction
What bursae are found in the shoulder?
Subacromial, subdeltoid, and subtendinous bursa of subscapularis.
These reduce friction in areas of high movement.
Contains axillary nerve
What structures pass through the quadrangular space?
Axillary nerve and posterior circumflex humeral artery.
Quadrangular space located near deltoid and teres muscles.
Overlapping blood supply
What arteries are part of shoulder anastomosis?
Suprascapular, dorsal scapular, and circumflex scapular arteries.
Ensures blood flow around shoulder.
Three-part actions
What are the attachments and actions of the deltoid?
Attaches lateral third of clavicle, acromion, and spine of scapula to deltoid tuberosity; actions include flexion, abduction, and rotation.
Deltoid’s distinct parts allow various shoulder movements.
