Practical 1 Flashcards
***Note: All of the bony parts are seen from an inferior aspect of the clavicle
How can you determine if you are examining the left or right clavicle?
- Acromial end is more rounded and blunt than the sternal end
- The sternal end is wider than the acromial end
- Once you determine the above two, check for the superior surface (which is smooth)
How can you determine if you are examining the left or right scapula?
- Locate the glenoid cavity which faces the lateral side
- Locate the spine of the scapula which faces the posterior surface
How can you determine if you are examining the left or right humerus?
- Identify the greater and lesser tubercles of the proximal humerus to help determine the posterior aspect of the humerus
- Locate the capitulum and trochlea to confirm the anterior and posterior aspect
- Identify the medial epicondyle of the distal humerus since it is larger and more prominent than the lateral epicondyle
What is the difference between the glenoid labrum and the glenoid cavity?
Glenoid cavity = shallow depression
Glenoid labrum = fibrocartilaginous rim attached around the margin of the glenoid cavity.
Classify the sternoclavicular joint?
Synovial saddle joint
Classify the acromioclavicular joint?
Synovial plane joint
Classify the glenohumeral joint?
Synovial ball-and-socket joint
Name the joint which is supported by each of the following ligaments?
Acromioclavicular = acromioclavicular joint
Costoclavicular = sternoclavicular joint
Glenohumeral = glenohumeral joint
Coracohumeral = glenohumeral
What features of the shoulder joint make it susceptible to dislocation?
Shallow glenoid cavity
Why is an anterior dislocation more likely than a posterior dislocation?
Majority of the muscles pull the shoulder forward anteriorly, making it more susceptible for anterior dislocations.
PECTORALIS MAJOR
O = Clavicular and sternocostal heads
I = Lateral lip of the bicipital groove
NS = Lateral pectoral nerve & Medial pectoral nerve
M = Adduction & medial rotation of the humerus
*Clavicular = flexes humerus
*Sternocostal = extends humerus
PECTORALIS MINOR
O = At ribs 3, 4 and 5
I = Coracoid process of the scapula
NS = Medial pectoral nerve
M = Stabilises the scapula & Accessory muscle of respiration when pectoral girdle is fixed
SUBCLAVIUS
O = The junction of the 1st rib and its costal cartilage
I = Subclavian groove of clavicle
NS = Subclavian nerve
M = Depresses the lateral clavicle
SERRATUS ANTERIOR
O = External surface of ribs 1-8
I = Anterior (costal) surface on the medial scapular border
NS = Long thoracic nerve
M = Protracts the scapula & holds it to the thoracic wall when punching or reaching objects anteriorly
TRAPEZIUS
O = Superior nuchal line & nuchal ligament spinous processes of C7-T12
I = Lateral ⅓ of the clavicle, acromion and spine of the scapula
NS = CN XI accessory nerve (motor fibres) & C3 and C4 nerve (sensory)
M = Elevates the scapula (descending fibres), retracts the scapula (middle fibres) & depresses the scapula (ascending fibres)
LATISSIMUS DORSI
O = Spinous processes of T7-T12, thoracolumbar fascia, iliac crest, lower 4 ribs
I = Bicipital groove
NS = Thoracodorsal nerve
M = Extension, adduction and medial rotation of the humerus & raises the body to the arms during climbing
LEVATOR SCAPULAE
O = Transverse process of C1-C4
I = Superior angle (or superior border) of the scapula
NS = Dorsal scapular nerve
M = Elevates the scapula
RHOMBOID MINOR
O = Spinous processes of the 7th cervical vertebrae & 1st thoracic vertebrae
I = Medial border of the scapula (level of the spine)
NS = Dorsal scapular nerve
M = Retracts the scapula & rotate the scapula to tilt the glenoid cavity inferiorly
RHOMBOID MAJOR
O = T2-T5 spinous processes
I = Medial border of the scapula (inferior to the spine)
NS = Dorsal scapular nerve
M = Retracts the scapula & rotate the scapula to tilt the glenoid cavity inferiorly
DELTOID
O = Lateral ⅓ of the clavicle, Acromion & spine of the scapula
I = Deltoid tuberosity of the humerus
NS = Axillary nerve
M = Anterior part flexes the arm, middle fibres abduction of the arm after 15 degrees and posterior fibres extend the arm.
TERES MAJOR
O = Inferior lateral border of the scapula
I = Medial lip of the bicipital groove of the humerus
NS = Lower subscapular nerve
M = Adduction & medial rotation at the shoulder joint
SUPRASPINATUS
O = Supraspinous fossa
I = Superior facet of the greater tubercle of the humerus
NS = Suprascapular nerve
M = Abducts arm to 15 degrees
INFRASPINATUS
O = Infraspinous fossa
I = Middle facet of the greater tubercle of the humerus
NS = Suprascapular nerve
M = Lateral rotators of the arm at the shoulder joint
TERES MINOR
O = Superior part of the lateral scapular border
I = Inferior facet of the greater tubercle of the humerus
NS = Axillary nerve
M = Lateral rotators of the arm at the shoulder joint
SUBSCAPULARIS
O = Subscapular fossa
I = Lesser tubercle of the humerus
NS = Upper subscapular nerve & lower subscapular nerve
M = Medial rotator & adductor of the arm at the shoulder joint
LONG HEAD OF BICEPS BRACHII
O = Supraglenoid tubercle of the scapula
I = Radial tuberosity
NS = Musculocutaneous nerve
M = Flexion and supination of the forearm
SHORT HEAD OF BICEPS BRACHII
O = Coracoid process of the scapula
I = Radial tuberosity
NS = Musculocutaneous nerve
M = Flexion and supination of the forearm
CORACOBRACHIALIS
O = Coracoid process of the scapula
I = Middle third of the humerus shaft (medial side)
NS = Musculocutaneous nerve
M = Adductor of the arm
BRACHIALIS
O = Distal two thirds of the anterior surface of the humerus
I = Ulnar tuberosity
NS = Musculocutaneous nerve
M = Chief flexor of the forearm
LONG HEAD OF TRICEPS BRACHII
O = Infraglenoid tubercle of the scapula
I = Olecranon process
NS = Radial nerve
M = Assists with the extension and adduction of the arm at the shoulder joint
MEDIAL HEAD OF TRICEPS BRACHII
O = Posterior surface of the humerus (inferior to the radial groove)
I = Olecranon process
NS = Radial nerve
M = Extension of the forearm
LATERAL HEAD OF TRICEPS BRACHII
O = Posterior surface of the humerus (superior to the radial groove)
I = Olecranon process
NS = Radial nerve
M = Assists with forearm extension at the elbow joint when the forearm is supinated or pronated
- Coracoacromial ligament
- Coracohumeral ligament
- Superior glenohumeral ligament
- Middle glenohumeral ligament
- Inferior glenohumeral ligament
- Trapezoid ligament
- Conoid ligament
- Transverse scapular ligament
- Acromioclavicular ligament
- Supraspinatus tendon
What are the muscles that join the scapula to the humerus?
Deltoid
Supraspinatus
Infraspinatus
Subscapularis
Teres major
Teres minor
What are the muscles that attach to the coracoid process of the scapula?
Pectoralis minor
Coracobrachialis
Short head of the biceps brachii
What are the muscles that move the scapula, but are NOT attached to the humerus?
Trapezius
Rhomboid major
Rhomboid minor
Levator scapulae
Serratus anterior
What are the muscles that attach to the greater tubercle of the humerus?
Supraspinatus
Infraspinatus
Teres major
What are the muscle that attaches to the lesser tubercle of the humerus?
Subscapularis
- Clavicle
- Acromial end of the clavicle
- Acromion
- Greater tubercle of the humerus
- Head of the humerus
- Lesser tubercle of the humerus
- Surgical neck of the humerus
- Coracoid process of the scapula
- Glenoid fossa
- Shoulder joint
- Lateral border of the scapula
- Lateral supracondylar ridge
- Medial supracondylar ridge
How can you determine if you are examining the left or right radius?
- The radial tuberosity is on the medial side
- The styloid process is on the lateral side
How can you determine if you are examining the left or right ulna?
- The olecranon sits in the posterior surface
- The radial notch is on the lateral side of the ulna
- The styloid process is on the medial side
What are the articular surfaces for the ulnohumeral (elbow) joint?
Trochlea notch of the ulna
Trochlea of the humerus
What are the articular surfaces for the proximal radio-ulnar joint?
Head of the radius
Radial notch of the ulna
Classify the ulnohumeral (elbow) joint?
Synovial hinge joint
Flexion and extension
Classify the proximal radio-ulnar joint?
Synovial pivot joint
Supination and pronation
What is the joint which is supported by the radial and ulnar collateral ligaments?
Ulnohumeral (elbow) joint
What is the joint which is supported by the annular ligament?
Proximal radio-ulnar joint