Lecture 12 (SECOND MIDTERM) Flashcards
Homolog of triceps =
quadriceps
Homolog of pectoral group =
adductors
Homolog of deltoid =
glutei
Homolog of brachii =
hamstrings
Brachial plexus... Dorsal scapular nerve: Nerve to subclavius: Suprascapular: Pectoral (medial and lateral):
Dorsal scapular nerve: C5
Nerve to subclavius: C5-C6
Suprascapular: C5-C6
Pectoral (medial and lateral): C5-T1
Brachial plexus... Subscapular: Thoracodorsal: Axillary: Medial antibrachial cutaneous:
Subscapular: C5-C6
Thoracodorsal: C6-C8
Axillary: C5-C6
Medial antibrachial cutaneous: C8-T1
Brachial plexus... Musculocutaneous: Median: Ulnar: Radial:
Musculocutaneous: C5-T1
Median: C6-T1
Ulnar: C8-T1
Radial: C5-T1
What is a “weird” muscle that doesn’t receive innervation from brachial plexus?
What kind of muscle is it?
Trapezius
Branchial
Trapezius... Origin: Insertion: Innervation: Action:
Origin: occipital bone, spines of C7-T12
Insertion: acromion, spine of scapula, lateral 1/3 of clavicle
Innervation: accessory nerve (cranial nerve XI)
Action: extension of the head, elevation and depression of scapula and gleaned
Evolutionary grouping of the trapezius:
branchial
Serratus anterior... Origin: Insertion: Innervation: Action:
Origin: first 9 ribs
Insertion: medial edge of scapula’s deep surface
Innervation: long thoracic nerve
Action: rotates and protracts scapula, also elevates glenoid
The borders and angles of the scapula, the scapular spine, the deep surface of the scapula (subscapular fossa) all belong to what division?
Dorsal
Since latissimus dorsi doesn’t attach to the scapula, it is…
caudal
and dorsal
What is on the “opposite side” of the latissimus dorsi and works in a synergist way?
pectoralis major
adducts and medially rotates humerus
Pectoralis major is so big that it crosses 2 boundaries, making it part of 2 quadrants. What are they?
cranial/ventral
caudal/ventral
The clavicular head of the pectoralis major... Quadrant: Origin: Insertion: Innervation:
Quadrant: cranial/ventral
Origin: inferior margin of clavicle
Insertion: greater tubercular crest of humerus
Innervation: medial and lateral pectoral nerves
the sternal head of the pectoralis major... Quadrant: Origin: Insertion: Innervation:
Quadrant: caudal/ventral
Origin: ventro-lateral margin of sternum, costal cartilages 1-6
Insertion: greater tubercular crest of humerus
Innervation: medial and lateral pectoral nerves
Pectoralis minor... Quadrant: Origin: Insertion: Innervation: Function:
Quadrant: cranial/ventral Origin: ribs 3-6 Insertion: coracoid process of scapula Innervation: medial pectoral nerve Function: stabilization of scapula
Medial and lateral cords only have what division neurons in them?
ventral division
The scapular spine is a derivative of…
the acromion
Teres major was originally a “piece” of…
latissimus dorsi
Teres major... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/dorsal
Origin: inferior angle of scapula
Insertion: lesser tubercular crest/groove
Action: extends, adducts, and medially rotates humerus
Innervation: lower subscapular
Subscapularis... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/dorsal Origin: subscapular fossa of scapula Insertion: lesser tubercle Action: medially rotates humerus Innervation: upper and lower subscapular
Teres minor... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/dorsal Origin: lateral border of scapula Insertion: greater tubercle Action: laterally rotates humerus Innervation: axillary
Deltoideus... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/dorsal Origin: lateral half of clavicle Insertion: deltoid tuberosity of humerus Action: abducts humerus (also flexes, extends, rotates, and adducts) Innervation: axillary nerve
Supraspinatus... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/ventral Origin: supraspinous fossa of scapula Insertion: greater tubercle of humerus Action: abducts humerus Innervation: suprascapular nerve
Infraspinatus... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/ventral Origin: infraspinous fossa of scapula Insertion: greater tubercle of humerus Action: laterally rotates humerus Innervation: suprascapular
What are the muscles of the rotator cuff?
Supraspinatus
Infraspinatus
Teres minor
Subscapularis
What makes up part of the mass of the upper arm but DOESN'T actually cross the elbow joint? Quadrant: Origin: Insertion: Innervation: Action:
coracobrachialis Quadrant: cranial/ventral Origin: coracoid process Insertion: midshaft of humerus Innervation: musculocutaneous nerve Action: adducts humerus and flexes at the shoulder
Triceps brachii has 2 innervation. What are they?
radial nerve
axillary nerve
Triceps long head…
Origin:
Quadrant:
Origin: infraglenoid tubercle
Quadrant: cranial/dorsal
Triceps medial and lateral head…
Origin:
Quadrant:
Origin: posterior surface of humeral shaft
Quadrant: caudal/dorsal
Triceps (in general)…
Insertion:
Action:
Insertion: olecranon process of ulna
Action: extends elbow
Biceps brachii... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/ventral
Origin: short head=coracoid process
long head=supraglenoid process
Insertion: radial tuberosity of proximal radius
Action: flexes elbow and shoulder supinates
Innervation: musculocutaneous nerve
What are the 3 layers of the wrist flexors (superficial to deep)?
Palmaris longus
Flexor digitorum superficialis
Flexor digitorum profundus
Palmaris longus... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: caudal/ventral Origin: medial epicondyle of humerus Insertion: palmar aponeurosis Action: flexes wrist Innervation: median nerve
Flexor digitorum superficialis... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: caudal/ventral
Origin: medial epicondyle of humerus
Insertion: middle phalanges of fingers 2-5
Action: flexes wrist and middle phalanges
Innervation: median nerve
Flexor digitorum profundus... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: caudal/ventral Origin: anteromedial surface of ulna Insertion: distal phalanges of fingers 2-5 Action: flexes distal phalanges Innervation: median and ulnar nerves
What are the layers of the extensors of the wrist (superficial to deep)?
Extensor digitorum
Abductor pollicis longus
Extensor digitorum... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: caudal/dorsal
Origin: lateral epicondyle of humerus
Insertion: distal phalanges of fingers 2-5
Action: extends fingers and wrist; abducts fingers
Innervation: radial nerve
Abductor pollicis longus... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: caudal/dorsal Origin: posterior surface of radius and ulna Insertion: base of 1st metacarpal Action: abducts and extends thumb Innervation: radial nerve
What are the muscles of..
Supination?
Pronation?
Supination: supinator and biceps brachii
Pronation: pronator teres
Supinator... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: cranial/dorsal Origin: lateral epicondyle of humerus Insertion: proximal end of radius Action: supinates forearm Innervation: radial nerve
Pronator teres... Quadrant: Origin: Insertion: Action: Innervation:
Quadrant: caudal/ventral Origin: medial epicondyle of humerus Insertion: lateral radius (midshaft) Action: pronates forearm Innervation: median nerve
