Flashcards in Scapular Region and Posterior Arm Deck (22)
The supraspinatus initiates _______ of the arm.
What nerve supplies the trapezius?
Spinal accessory nerve (cranial nerve XI)
Which two bones make up the shoulder girdle?
Scapula and clavicle.
What is the action of the anterior arm compartment? What nerve innervates it?
Flex arm at shoulder and elbow. Musculocutaneous nerve.
What is the action of the posterior arm compartment? What nerve innervates it?
Extend forearm at the elbow. Radial nerve.
What is the action of the anterior forearm compartment? What nerve innervates it?
Flex forearm, wrist, and digits, and also pronate the forearm. Median and ulnar nerve innervation.
What is the action of the posterior forearm compartment? What nerve innervates it?
Extend the forearm and digits, supinate the forearm. Radial nerve innervation.
The coracoid process, acromion, spine, and glenoid fossa are all features of the ________.
With which part of the sternum does the clavicle articulate?
the manubrium of the sternum
What are the possible movement directions of the sternoclavicular joint?
Elevation/depression, protraction/retraction, circumduction.
Name the two coracoclavicular ligaments.
Conoid and trapezoid ligaments
Is the scapulothoracic joint actually a joint?
What are the possible directions of movement at the scapulothoracic joint?
Protraction/retraction, elevation/depression, rotation
Describe the Group 1, Group 2, and Group 3 muscles of the shoulder.
Group 1 muscles are the ones that originate on the body and attach to the humerus.
Group 2 muscles originate on the body and attach to the scapula.
Group 3 muscles include the girdle muscles to the humerus and the rotator cuff muscles.
The supraspinatus muscle acts to _________ the shoulder to around 15 degrees, after which the deltoid takes over.
Where on the humerus is a fracture most likely to occur?
The surgical neck
To achieve 180 degrees of abduction at the shoulder, roughly ____ degrees occurs at the glenohumeral joint while the other _____ degrees occurs at the ___________ joint.
120 occurs at the glenohumeral joint while 60 occurs at the scapulothoracic joint
Name the four rotator cuff muscles.
Supraspinatus, infraspinatus, subscapularis, teres minor.
Why isn't teres major considered a rotator cuff muscle?
Because it doesn't insert on the humeral head, it inserts below near the anteromedial aspect of the surgical neck.
Surgical ligation of the subclavian-axillary artery is possible due to extensive anastomotic connections of the scapula. Which three arteries participate in supplying the scapula after ligation and which artery reverses its flow to drain, instead of supply the region?
These supply the scapula:
1. Intercostal arteries
2. Suprascapular artery
3. Transverse cervical arteries
The suprascapular artery flow will reverse so that it drains, instead of supplies the scapular region.
Fracture of the surgical neck of the humerus may injure which two structures?
Axillary nerve and posterior humeral circumflex as they pass through the quadrangular space.