The pectoral girdle Flashcards
What is another term for the arm
The brachium
If you rotate the glenoid clockwise what kind of rotation is this called
Superior rotation
Where does the clavicle attach to the scapula
At the clavicular facet on the acromion
What is the joint going the clavicle to the scapula
Acromioclavicular joint
What is the joint joining the clavicle to the sternum
Sternoclavicular joint
Where does deltoid insert on the clavicle
At the deltoid tubercle on the anterior lateral part of clavicle
Where does trapeziums insert on clavicle
Posterior lateral surface of clavicle
What attaches tot he medial anterior surface of clavicle
Pec major
What are the borders of the scapula called
Superior, medial and lateral
What are the angles of the scapula called
Superior inferior and glenoid fossa
What are the protuberances of the scapula called
The acromion and the coracoid process and the spine
What kind of joint is the sternoclavicular joint
A synovial joint, a saddle shaped joint that allows for a lot movement.
What are the ligaments of the sternoclavicular joint
Anterior and posterior sternoclavicular ligaments. Costoclavicular ligament. Interclavicular ligament.
Name the muscle that sits underneathh the clavicle lateral to the costoclavicular ligmanet
Subclavius (inserts in subclavian groove in clavicle)
What kind of joint is the acromioclavicular joint
Synovial joint which holds an intraarticular disc.
What are the ligaments supporting the acromioclavicular joint
The coracoclavicular ligament (two parts the conoid and the trapezoid) and the acromioclavicular ligament
What is the third joint of the pectoral girdle
The conceptual joint. Between medial border of scapula and thorax.
Describe the trapezius muscle
Origin from the skull down spine to T12. Inserts in the anatomical horse shoe which is made from the superior border of the clavicle and acromium and spine of the scapula. Broken into superior middle and inferior portions. Can work together or separately.
Nerve is a cranial nerve ‘accessory’
Describe levator scapulae
Origin from transverse processes of cervical vertebra. Inserts into acromium. Elevates the scapula.
Dorsal scapula nerve
Describe rhomboid minor and major
Origin down spinous processes to about T6. Insert along medial border of scapula. Retract scapula. Dorsal scapula nerve.
Describe latissimus dorsi
Origin spinous processes T7-S5. But with big broad aponeurosis. Inserts into the intertubucular groove anterior humerus. Adducts the humerus. Internally rotates humerus. Nerve thoracodorsal.
What muscle is well developed in surfers and swimmers
Latissmus dorsi and pectoralis major as lots of arm adduction against resistance
Describe pectoralis major
Origin anterior medial clavicle and sternum. .. Inserts lateral lip of intertubercular grove (anterior humerus). Humerus adductionInternal rotation. Nerve lateral and medial pectoral n.
Describe pectoralis minor
Origin ribs 3-5. Insertion coracoid process. Depresses and protracts scapula. N. medial pectorial n.
Describe subclavius
Origin 1st rib cartilage insertion lateral clavicle. Stabilises clavicle. N C5
What occurs in ‘saturday night palsy’
There is a neurovascular bundle that runs inferior to the coracoid process deep to pec. minor. If the arm is abducted for too long/ too far pec minor compresses the bundle against the process.
Describe serratus anterior
origin ‘serrated edge’ lateral anterior surface of ribs. Runs superficial to the scapula and inserts on its lateral border. The boxers muscle as it protracts the scapula. N. Long thoracic nerve.
