Lecture 12 (SECOND MIDTERM) Flashcards by Cassidy Griego

Homolog of triceps =

quadriceps

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Homolog of pectoral group =

adductors

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Homolog of deltoid =

glutei

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Homolog of brachii =

hamstrings

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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

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Brachial plexus...
Subscapular:
Thoracodorsal:
Axillary:
Medial antibrachial cutaneous:

Subscapular: C5-C6
Thoracodorsal: C6-C8
Axillary: C5-C6
Medial antibrachial cutaneous: C8-T1

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Brachial plexus...
Musculocutaneous:
Median:
Ulnar:
Radial:

Musculocutaneous: C5-T1
Median: C6-T1
Ulnar: C8-T1
Radial: C5-T1

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What is a “weird” muscle that doesn’t receive innervation from brachial plexus?
What kind of muscle is it?

Trapezius

Branchial

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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

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Evolutionary grouping of the trapezius:

branchial

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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

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The borders and angles of the scapula, the scapular spine, the deep surface of the scapula (subscapular fossa) all belong to what division?

Dorsal

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Since latissimus dorsi doesn’t attach to the scapula, it is…

caudal

and dorsal

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What is on the “opposite side” of the latissimus dorsi and works in a synergist way?

pectoralis major

adducts and medially rotates humerus

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Pectoralis major is so big that it crosses 2 boundaries, making it part of 2 quadrants. What are they?

cranial/ventral

caudal/ventral

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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

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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

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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 ```