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Anatomy course (Back) > Muscles (Origins, Insertions, Innervation, and Action) > Flashcards

Muscles (Origins, Insertions, Innervation, and Action) Flashcards

1
Q

Obliquus Capitis Inferior
Origin?
Insertion?

A

Origin: Arises from the spinous process of the C2 Vertebra
Insertion: Into the transverse process of C1

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2
Q

Obliquus capitis superior
Origin?
Insertion?

A

Origin: Arises from the spinous process of C1
Insertion: Into the occipital bone between superior and inferior nuchal lines.

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3
Q

Rectus capitis posterior major
Origin?
Insertion?

A

Origin: Arises from the spinous process of the C2 vertebra
Insertion: Into the lateral part of the inferior nuchal line of the occipital bone

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4
Q

Rectus capitis posterior minor
Origin?
Insertion?

A

Origin: Arises from the posterior tubercle on the posterior arch of the C1 vertebra
Insertion: Into the medial third of the inferior nuchal line

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5
Q 
Supraspinatus
Origin?
Insertion?
Innervation?
Action?
A

Origin: Supraspinous fossa
Insertion: superior facet of greater tubercle of the humerus
Innervation: Subscapular nerve (C4,5,6)
Action: Assist/ initiates deltoid abduction of shoulder joint

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6
Q 
Infraspinatus
Origin?
Insertion?
Innervation?
Action?
A

Origin: Infraspinous fossa
Insertion: middle facet of greater tubercle
Innervation: Suprascapular nerve C5, 6
Action: Laterally rotates shoulder joint, helps hold humeral head in glenoid cavity

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7
Q 
Subscapularis
Origin?
Insertion?
Innervation?
Action?
A

Origin: Subscapular fossa
Insertion: lesser tubercle
Innervation: Upper and lower subscapular nerve (C5,6,7)
Action: Medially rotates and adducts shoulder joint, helps hold humeral head in glenoid cavity

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8
Q 
Teres Minor
Origin?
Insertion?
Innervation?
Action?
A

Origin: Middle part of the lateral border of the scapula
Insertion: Inferior facet of greater tubercle
Innervation: Axillary nerve C5,6
Action: Laterally rotates shoulder joint, holds humeral head in glenoid cavity.

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9
Q 
Teres Major
Origin?
Insertion?
Innervation?
Action?
A

Origin: Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula
Insertion: Medial lip of intertubercular sulcus
Innervation: Lower subscapular nerve C5,6
Action: Adducts and medially rotates

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10
Q 
Deltoid
Origin?
Insertion?
Innervation?
Action?
A

Origin: Lateral 1/3 of clavicle, acromion, and spine of scap
Insertion: deltoid tuberosity
Innervation: Axillary nerve C5,6
Action: Clavicle- flexes medially rotates
Acromion- abducts
Spine- extends, laterally rotates

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11
Q 
Pectoralis Major
Origin?
Insertion?
Innervation? 
Action?
A

Origin: Clavicular head- anterior surface of medial half of clavicle
Sternocostal head- Anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle
Insertion: Lateral lip of intertubercular sulcus of humerus
Innervation: Lateral and media pectoral nerves, Clavicular head C5,6 Sternocostal head: C7,8,9
Action: Adducts, medially rotates shoulder joint, draws scapula anteriorly and posteriorly.
Clavicular head alone: flexes shoulder joint
Sternocostal head alone: extends shoulder joint from the flexed position

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12
Q 
Pectoralis Minor
Origin?
Insertion?
Innervation?
Action?
A

Origin: 3-5th ribs near their costal cartilage
Insertion: Medial border and superior surface of coracoid process of scapula
Innervation: Medial pectoral nerve (C8, T1)
Action: Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

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13
Q 
Serratus Anterior
Origin?
Insertion?
Innervation?
Action?
A

Origin: External surfaces of lateral parts 1-8th ribs
Insertion: anterior surface of medial border of scapula
Innervation: Long thoracic nerve C5,6,7
Action: protracts the scapula and holds against thoracic wall, rotates scapula

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14
Q 
Subclavius
Origin?
Insertion?
Innervation?
Action?
A

Origin: junction of 1st rib and its costal cartilage
Insertion: Inferior surface of middle third of clavicle
Innervation: Subclavian nerve (C5,6)
Action: Anchors and depresses the clavicle

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15
Q 
Omohyoid
Origin?
Insertion?
Innervation?
Action?
A

Origin: Superior border of scapula near suprascapular notch
Insertion: Inferior border of hyoid
Innervation: C1-C3 by a branch of ansa cervicalis
Action: depresses, retracts, steadies hyoid

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16
Q 
Biceps Brachii
Origin?
Insertion?
Innervation?
Action?
A

Origin: Short head: tip of coronoid process
Long Head: Supraglenoid tubercle of scapula
Insertion: tuberosity of radius and fascia of forearm via bicipital aponeurosis
Innervation: Musculocutaneous nerve (C5,6)
Action: Supinates forearm and when it is supinated, flexes elbow. Also flexes shoulder joint, short head resists dislocation of the shoulder

17
Q 
Brachialis
Origin?
Insertion?
Innervation?
Action?
A

Origin- distal half of anterior surface of humerus
Insertion: coronoid process and tuberosity of ulna
Innervation: Musculocutaneous nerve (C5,6)
Action: flexes elbow joint in all positions

18
Q 
Coracobrachialis
Origin?
Insertion?
Innervation?
Action?
A

Origin: tip of coronoid process of scapula
Insertion: Middle third of medial surface of humerus
Innervation: Musculocutaneous nerve (C5,6)
Action: Helps flex and adduct shoulder joint, resist dislocation of the shoulder

19
Q 
Triceps Brachii
Origin?
Insertion?
Innervation?
Action?
A

Origin: Long head- infraglenoid tubercle of scapula
Lateral head- posterior surface of humerus, superior to radial groove
Medial head- Posterior surface of humerus, inferior to radial groove
Insertion: Proximal end of olecranon of ulna and fascia of forearm
Innervation: Radial nerve (C6,7,8)
Action: Chief extensor of elbow. LONG head: extends shoulder joint and resists dislocation of humerus (Important during abduction)

20
Q 
Brachioradialis
Origin?
Insertion?
Action?
Innervation
A

Origin- Proximal 2/3 of the lateral supraepicondylar ridge of the humerus
Insertions: lateral surface of distal end of radius proximal to styloid process
Action: Weak flexion of elbow, maximal when forearm in in midpronated positiong
Innervation: Radial nerve

21
Q 
Extensor carpi radialis brevis
Origin?
Insertion?
Action?
Innervatio?
A

Origin: Lateral supraepicondylar ridge of the humerus
Insertion: Dorsal aspect of base of 2nd metacarpal
Action: Extend and abduct wrist joint
Innervation: Radial nerve

22
Q

Extensor carpi radialis brevis

A

Origin: Lateral epicondyle of humerus
Insertion: Dorsal aspect of base of 3rd metacarpal
Action: Extend and abduct wrist joint, active during fist clenching
Innervation: Deep branch of radial nerve

23
Q

Extensor digitorum

A

Origin: Lateral epicondyle of the humerus
Insertion: extensor expansions of medial four fingers
Action: Extends wrist joint, extends medial four fingers primarily at metacarpophalangeal joints, secondarily at IP joints
Innvervation: Deep branch of radial nerve

24
Q

Extensor digiti minimi

A

Origin: Lateral epicondyle of humerus
Insertion: extensor expansion of 5th finger
Action: Extends wrist joint, extends 5th finger at metacarpophalangeal joint, secondarily at IP joint
Innervation: Posterior interroseous nerve

25
Q

Extensor carpi ulnaris

A

Origin: Lateral epicondyle of humerus, posterior border of ulna via a shared aponeurosis
Insertion: Dorsal aspect of base of 5th metacarpal
Action: Extends and adducts wrist joint, active during fist clenching
Innervation: Posterior interroseous nerve

Anatomy course (Back) (11 decks)

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