exam 4 Flashcards
action of teres major muscle on the shoulder
internal rotation
what movement of the shoulder is produced by contraction of teres minor
external rotation
structure that passes under coracoarcomial arch
supraspinatus tendon
which rotator cuff tendon is likely torn if a patient demonstrates weakness in internal rotation
subscapularis
which muscle attaches to the coracoid process of the scapula and pulls inferiorly when it contracts
pectoralis minor
which muscle helps to stabilize the scapula against the thoracic wall
serratus anterior
which ligament stabilizes the long head of biceps tendon at the intertubercular sulcus
transverse humeral ligament
which part of the deltoid produces shoulder extension when it contracts
posterior
action of infraspinatus muscle on shoulder
external rotation of humerus
which ligament stabilizes the acromioclavicular joint by limiting inferior and medial displacement of the acromion distal to the clavicle
coracoclavicular ligaments
which muscles adducts and internally rotates shoulder
pectoralis major
action of coracobrachialis on the shoulder
flexion
action of long head of triceps on shoulder
extension
action of rhomboid minor and major on shoulder
scapular retraction
action of levator scapulae on scapular rotation
downward rotation
the sternoclavicular joint is which type
saddle-type synovial
the sternoclavicular joint is the articulation between
upper extremity and axial skeleton
the sternal end of the clavicle articulates with
manubrium and 1st rib
the sternoclavicular joint is covered with
fibrocartilage
the costoclavicular ligament connects from
inferior sternal end
1st rib and costal cartilage
joint that provides major axis of rotation for clavicle and scapula
saddle-type toroid
the sternoclavicular joint glides freely in which planes
frontal and transverse
the sternoclavicular joint allows for rotation in which plane
sagittal
the sternoclavicular joint has maximal shoulder elevation in which position
closed-packed position
the acromioclavicular joint is which type
planar
most horizontal ligament attaching from superior coracoid to trapezoid line on inferior clavicle
trapezoid ligament
ligament that is vertical and triangular with apex on caracoid process base to conoid tubercle of clavicle
conoid ligament
coracoclavicular joint is which type
syndesmosis-type amphiarthroidal
which ligament limits excessive superior glide of coracoclavicular joint
conoid
which ligament limits shearing forces that drive acromion medially and ineriorly under the clavicle
trapezoid ligament
major suspensory ligament of the shoulder
coracoclavicular ligament
the glenohumeral joint is what type
ball-and-socket
attaches with fibrocartilaginous tissue and deepens the glenoid cavity
glenoid labrum
the glenohumeral joint capsule has two openings for
-long head of biceps tendon
-communication between subscapularis bursa and joint
tendons of the rotator cuff compared to the coracoacromial arch pass
deep to the arch
strong fibro-ossesous arch from acromion to coracoacromial to coracoid process
coracoacromial arch
not a true joint, between scapula and its muscles and the posterior thoracic wall
scapulothoracic joint
scapulothoracic joint motions depend on
the motions of the sternoclavicular and acromioclavicular joints
elevation of the humerus in any plane is paired with what degree of external rotation
55 degrees
a regular pattern of scapular rotation that accompanies and facilitates humeral abduction
scapulohumeral rhythm
which two joints move simultaneously through most of the full range of shoulder elevation
scapulothoracic
glenohumeral
180 degrees of abduction comes from
120 degrees glenohumeral (abduction)
60 degrees scapulothoracic (upward rotation)
during shoulder abduction the clavicle retracts at the
SC joint
during full shoulder abduction the scapula
posteriorly tilts
externally rotates
during shoulder abduction the clavicle
posteriorly rotates around its own axis
during shoulder abduction the GH joint
externally rotates
glenohumeral translation is less during
active shoulder motion
individuals with muscle fatigue or glenohumeral instability consistently demonstrate
excessive superior glide of the humeral head during active shoulder elevation
in abduction of the GH joint in the plane of the scapula, the humeral head undergoes
minimal superior glide
the difference in degree of movement between the scapula and clavicle during elevation suggests
they move separately at the AC joint
pec major attachments
-sternocostal and
medial clavicular head
-intertubercular sulcus
pec major action
adducts and internally rotates humerus
pec major innervation
medial and lateral pec nerves
pec minor attachments
3rd-5th ribs
coracoid process
pec minor action
pulls scapula inferiorly and anteriorly
pec minor innervation
medial pec nerve (C8-T1)
subclavius attachments
-1st costochondral junction
-inferior clavicle
subclavius action
stabilizes and depresses clavicle
subclavius innervation
nerve to subclavius (C5,C6)
serratus anterior attachments
-lateral ribs 1-8
-medial scapula
serratus anterior action
protracts and upwardly rotates scapula
serratus anterior innervation
long thoracic nerve (C5,C6,C7)
trap attachments
-medial 1/3 superior nuchal line and ligament
-EOP
-lateral 1/3 clavicle
-SPs C7-T12
-spine of scapula and acromion
all parts of the trap
retract and upwardly rotate the scapula
the upper trap alone
elevates scapula
the lower trap alone
depresses the scapula
trap innervation
spinal accessory (motor)
C3 and C4 spinal (sensory)
lat attachments
-SP T7-T12
-intertubercular sulcus of humerus
-iliac crest/lower ribs/fascia
lat action
extends, adducts, and internally rotates humerus
lat innervation
thoracodorsal nerve (C6,C7,C8)
levator scapulae attachments
-TP C1-C4
-medial border and spine of scapula
levator scapulae action
elevates and downwardly rotates scapula
levator scapulae innervation
dorsal scapular nerve (C4,C5)
cervical nerves (C3,C4)
rhomboid major attachments
-SP of T2-T5
-medial border to inferior angle of spine
rhomboid major action
retracts and downwardly rotates scapule
rhomboid major innervation
dorsal scapular nerve (C4,C5)
rhomboid minor
-nuchal ligament
-SP C7 and T1
-medial border of scapula
rhomboid minor action
retracts and downwardly rotates scapula
rhomboid minor innervation
dorsal scapular nerve (C4,C5)
