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- junction of the upper limb and trunk
- consists of scapular, deltoid and pectoral region, and the axilla
Large, flattened, triangular bone lying on the posterolateral surface of the thorax, overlapping parts of the second to the 7th rbs
Costal Surface of scapula
- concavity, subscapular fossa
- place for subscapularis muscle placement
Dorsal surface of scapula
- divided by spine into supraspinous and infraspinous fossa.
- fossae are connectd laterally by the spinoglenoid notch
- interrupts the superior border at the base of the coracoid process.
- Converted into a foramen by the superior transverse scapular ligament.
- Suprascapular vessels pass over the ligament and the suprascapular nerve passes under it.
- pearshaped fossa - glenoid fossa
- articulates with the rounded head of the humerus to form shoulder
- upper border of the glenoid cavity
- attaches the longhead of the biceps
- lateral border of the scapular immediately below the glenoid cavity is the thickening.
- Attaches the longhead of the triceps
Neck of scapula
narrow part of the scapula medial to the lateral angle
Spine of the scap
flat triangular plate projecting POST from upper part of dorsal surface. Posterior border of the spin is subcutaneous.
projects forwards from the lateral end of the spine and forms the point of the shoulder.
Angle of acromion
Subcuatenous bony prominence posterolaterally marks the sharp forward turn of the acromion
Acromion has a small, flat, oval facet that articulates with the LAT end of the clavicle to form it
- hooked, located medial to the upper border of the glenoid cavity, projects forward and slightly laterally
- Attachement for the pectoralis minor, coracobrachialis and short head of the biceps
- largely suspended by muscle
- articulates with humurus and clavicle
- long bone consisting of two expands ends connected by a shaft or body.
- Extends from root of neck laterally towards the point of the shoulder
- subcutaneous throughout
sternal end of clavicle
- enlarged quadrangular shape with a sellar-shaped articular surface
- convex vertically and slightly concave from front to back
- articulates with articular disc that separates it from the clavicular notch of the manubrium to form SC joint
shaft of clavicle
- slight S-shaped curve,
- convex forwards in its medial 2/3 and concave forward in its lateral 1/3
- along the back edge of the clavicle
- attachment of the conoid part of the coracoclavicular ligament
runs with the conoid tubercle toward acromial end. attachment for the coracoclavicular ligament.
Acromial end of clavicle
flattened and has a small, flat oval facet that articulates with the medial border of the acromion at the acromioclavicular joint
- ossifies before any other bone in the body
- only bone in the limbs that is formed by intramembranous ossification
acts as a strut which supports the shoulder and allows the lib to swing clear of the turnk
Extrinsic muscles features / insertion points
- not confined to the upper limb
- arise from axial skeleton
- insert on bones of either the pectoral girdle (scap and clavicle) or humerus
Extrinsic muscles and blood supply
- Back muscles, pectoral muscles, and serratus anterior
- supply from subclavian and axillary arteries
Intrinsic muscles of the shoulder features
- confined entirely to the upper limb
- arise from bones of the pectoral girdle and insert on the humerus
- only act at shoulder joint
Intrinsic muscles and supplies
- deltoid and muscles of scapular region
- C5, 6 through posterior division branches
- subclavian and axillary
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