8a. MSK HAL - Acland Videos Flashcards
(87 cards)
the scapula and clavicle articulate with the bones of the thorax and what point
sternoclavicular joint
The lateral end of the clavicle articulates with what part of the scapula and what joint does it form
the acromion, forming the acromio-clavicular joint
from above, the clavicle is what shaped
The clavicle from above is slightly S-shaped, with a forward curve to its medial half
what is the glenoid fossa
The glenoid fossa is the articular surface for the shoulder joint
what is above and below the glenoid fossa and what do these 2 things do
Above and below the glenoid fossa are the supraglenoid tubercle, and the infraglenoid tubercle, where two tendons are attached
what is the scapula spine and where is it
Arises from the dorsal surface, and divides it into the supraspinous fossa, and the infraspinous fossa
the clavicle articulates with the scapula where
The clavicle articulates with the scapula at the tip of the acromion
what is around the edge of the glenoid fossa and what does it do
Round the edge of the shallow glenoid fossa, a rim of fibrocartilage, the glenoid labrum, makes the socket of the shoulder joint both wider and deeper
what are the 2 acromio-clavicular ligaments
The acromio-clavicular joint has 2 strong ligaments, the trapezoid in front and the conoid behind, that fix the underside of the clavicle to the coracoid process.
is there movement at the acromioclavicular joint
There’s very little movement at the acromioclavicular joint
what is the shape of the articular surface of the head of humerus
The articular surface of the head of humerus is half of a sphere
what is on the anterior aspect of the head of humerus
well-marked groove known as the bicipital groove, because the tendon of the long head of the biceps runs in it
what is at the proximal end of the bicipital groove
At the proximal end of the groove are the lesser tubercle, and the greater tubercle
where is the deltoid tuberosity
On the lateral aspect of the humerus, almost halfway down the bone, is the deltoid tuberosity
what does the capsule of the shoulder joint do
The capsule of the shoulder joint doesn’t hold the bones together; it’s quite a weak structure. What it does is to permit movement
where does the long head of the triceps tendon arise from
The long head of triceps tendon arises from the infraglenoid tubercle
where does the long head of biceps arise from and what is the path it takes
The long head of biceps arises from the supraglenoid tubercle, it passes inside the joint capsule and over the top of the head of the humerus
where does the subscapularis arise from
where does its tendon insert
It arises from almost all of the anterior or costal aspect of the scapula. Its tendon inserts on the lesser tubercle
what movements does the subscapularis allow on its own and in conjunction with the other 3 muscles
Subscapularis, acting alone, produces internal rotation of the humerus. Acting with the other three short muscles, it holds the humeral head and the glenoid fossa together
what does the supraspinatus arise from and what is its path
It arises from almost all the supraspinous fossa. It passes under the acromion and inserts on the greater tubercle. The tendon of supraspinatus runs through a tight spot, between the acromion and the head of the humerus.
what does the supraspinatus allow in terms of movement
Supraspinatus initiates abduction of the humerus
what do the infraspinatus and teres minor arise from
arise from almost all the infraspinous fossa
where does the infraspinatus insert
Infraspinatus inserts on the back of the greater tubercle, teres minor just below it
what motion does the infraspinatus and teres minor produce
Both these muscles produce external rotation of the humerus.