10. Posterior Shoulder Flashcards
The medial part of the clavicle is called _ while the lateral end is called _
sternal facet
acromial end
The _ is the area where the deltoid muscle attaches
deltoid tubercle
T/F The lateral edge of the scapula is called the medial border
False (called the axillary border)
Name the 2 fossa on the posterior border of shoulder
supraspinous fossa
infraspinous fossa
The insertion point of the pectoralis minor is on the _
coracoid process
The lesser tubercle of the humerus is _ to the intertubercular groove
medial
The point of insertion for the deltoid is the _
deltoid tuberosity
The _ is also considered the funny bone
medial epicondyle
The fossa on the posterior part of the humerus is the _
olecranon fossa
The innervations of shoulder muscles are typically _ to the muscle
deep
The 3 origin points for the deltoid muscle are _
Clavicle
spine of scapula
acromion
The 3 actions of the deltoid are to _
flex/medially rotate
abduct humerus
extend/laterally rotate
The _ and _ are innervated by the axillary nerve
deltoid and teres minor
What is the origin of the supraspinatus muscle?
supraspinous fossa
The supraspinatus inserts onto the _
greater tubercle
What are the 2 actions of the supraspinatus?
Stabilize shoulder
Abducts humerus
The _ is the primary abductor of the arm until around 15 degrees, then the _ takes over
Supraspinatus
Deltoid
T/F The supraspinatus is innervated by the infrascapular nerve
False (suprascapular nerve)
Name the origin and insertion of the infraspinatus muscle
Infraspinous fossa
greater tubercle
Name the 2 actions of the infraspinatus
stabilize shoulder
laterally rotate humerus
The suprascapular nerve innervates _ and _
Supraspinatus
Infraspinatus
Teres minor inserts on the _
greater tubercle
What is the origin of the teres minor?
Dorsal axillary border
What are the 2 actions of teres minor?
Stabilize shoulder
Laterally rotate humerus
Teres major inserts on the _
medial lip of the intertubercular sulcus
T/F Teres major insertion is anterior to latissimus dorsi
False (posterior)
List the 3 actions of teres major
medially rotate humerus
adduct humerus
extend humerus
Teres major is innervated by _
lower subscapular nerve
Long head of the triceps brachii muscle originates on the _ and inserts on the _
infraglenoid tubercle
olecranon process of ulna
List the 3 actions of the long head of TB
Extend humerus
adducts humerus
extend forearm at elbow
What innervates the long head of TB?
radial nerve
What is the origin of the subscapularis?
ventral surface of scapula
The subscapularis inserts on the _
lesser tubercle
List the 3 actions of the subscapularis
stabilize shoulder joint
medially rotate humerus
adduct humerus
The subscapularis is innervated by _
upper and lower subscapular nerve
What are the muscles of the rotator cuff?
Subscapularis
infraspinatus
supraspinatus
teres minor
What muscles and structures create the quadrangular space?
Humerus
Long head of TB
Teres minor
Teres major
What creates the triangular interval?
Humerus
long head of TB
Teres major
What creates the triangular space?
Long head of TB
Teres major
teres minor
What nerve and artery pass through the quadrangular space?
Axillary nerve
Posterior humeral circumflex artery
What nerve and artery passes through the triangular space?
Circumflex scapular artery
No nerve runs through
What nerve and artery passes through the triangular interval?
Radial nerve
Profunda (deep) brachii artery
What is the greatest ROM in the body?
Glenohumeral joint
_ in the shoulder minimize friction
bursae
The glenohumeral joint is a type of _ joint
synovial
The joint capsule of the GH joint is composed of _ and _
fibrous and synovial joint capsule
Bursitis results from _
calcium deposits on bursae floor
_ is a partial or complete tear of the cartilaginous ring surrounding the glenoid fossa
torn labrum
