Anatomy Week 1 Flashcards
which muscles attach the axial skeleton to the proximal humerus
pectoralis major
latissimus dorsi
attachments of pectoralis major
A = manubrium and sternal body
upper 6 costal cartilages
external oblique aponeurosis ( sternocostal head)
medial 1/2 of clavicle (clavicular head)
B = lateral lip of the intertubercular sulcus of the humerus
attachments of latissimus dorsi
A = T6 to T12 spinous processes
lumbosacral fascia
iliac crest
B = floor of intertubercular groove of the humerus
what action does the latissimus dorsi do
able to move inferior angle of the scapula in different directions
internal rotation and adduction
what are the attachments of the serratus anterior
A = medial border of the scapula
B = ribs 1-8
attachments of the pectoralis minor
A - ribs 3-5
B = coracoid process
attachments of the subclavius muscle
A = costochondral joint of the first rib
B = subclavian groove on clavicle
attachments of the trapezius
A = nuchal line and ligament, external occipital protuberance and
C7 to T12 spinous processes
B = lateral 1/3 of clavicle posteriorly
= acromion medial border
= superior lip of spine of scapula
Rhomboid major attachments
A = T2 to T5 spinous processes
B = medial border of the scapula
lower down than the rhomboid minor
action of the rhomboid major and minor
retract the scapula
rhomboid minor attachments
A = C7 and T1 spinous processes
B = medial border of the scapula at the spine of it
attachments of levator scapulae
A = transverse processes of C1 + C2
= posterior tubercles of C3 + C4
B = medial border of the scapula (superior angle to root of spine)
action of levator scapulae
elevate the scapula
which muscles directly attach the clavicle or scapula to the axial skeleton
serratus anterior
subclavius
pec minor
trapezius
rhomboid major
rhomboid minor
levator scapulae
what muscles come under the category of scapulohumeral
- deltoid
- teres major
- teres minor
- supraspinatus
- infraspinatus
- subscapularis
attachments of the deltoid
A = lateral 1/3 of clavicle anteriorly
= lateral border of acromion
= lip of spine of scapula
B = deltoid tuberosity of humerus
actions of the deltoid
abduction
flexion and extension
attachments of teres major
A = inferior angle of scapula
B = intertubercular sulcus of humerus
attachments of supraspinatus
A = medial 2/3 of supraspinous fossa
B = superior facet of greater tubercle of humerus
attachments of infraspinatus
A = medial 2/3 of infraspinous fossa
B = central facet of greater tubercle of humerus
attachments of teres minor
A = axillary border of the scapula
B = inferior facet of the greater tubercle of humerus
attachments of subscapularis
A = medial 2/3 of costal surface of scapula
B = lesser tubercle of humerus
action of subscapularis
internal rotation
actions of supraspinatus
abduction ( pulls head of humerus medially in towards the glenoid cavity)
which muscles externally rotate the shoulder
infraspinatus
teres minor
which muscles adduct shoulder
pec major
latissimus dorsi
teres major
what are the flexors in the anterior compartment of arm
biceps brachii
brachialis
coracobrachialis
muscle in the posterior extensor compartment
triceps brachii
attachments of biceps brachii
long head = supraglenoid tubercle of glenoid cavity
short head = coracoid process
B = radial tuberosity
where does the short head of the biceps brachii attach
A = coracoid process
B = radial tuberosity
attachments of brachialis
A = inferior 1/2 of humerus
B = coronoid process and ulnar tuberosity
attachments of coracobrachialis
A = coracoid process
B = medial surface of midshaft of humerus
attachment A of long head of triceps
A = infraglenoid tubercle
attachment A of lateral head of triceps
A = posterior surface of humerus
superior to radial groove
attachment of medial head of triceps brachii
A = posterior surface of humerus inferior to radial groove
what is attachment B for long, lateral and medial heads of triceps
olecranon process of ulna
actions of biceps brachii
flexor and supinator
actions of brachialis
pure flexor
actions of coracobrachialis
flexor and adductor
what nerve innervates triceps
branches of the radial nerve
what nerve innervates the flexor compartment muscles such as the biceps, brachialis and coracobrachialis
musculocutaneous
which bone does the biceps attach to in the forearm
radius
which bone does the brachialis attach to in the forearm
ulna
what nerve innervates deltoid
axillary
what nerve innervates serratus anterior
long thoracic nerve
what nerve innervates latissimus dorsi
thoracodorsal nerve
