Human muscles day 1

Question 1

Abductor Digiti Minimi Origin Insertion Innervation Main action

Answer 1

Origin: Pisiform
Insertion: Base of the 5th proximal phalanx
Innervation: Ulnar nerve
Main action: Abduction of 5th digit (at 5th MCP joint)

Question 2

Abductor Pollicis Brevis Origin Insertion Innervation Main action

Answer 2

Origin: Flexor retinaculum
Insertion: Radial side of base of proximal phalanx
Innervation: Median nerve
Main action: Thumb abduction

Question 3

Abductor Pollicis Longus Origin Instertion Innervation Main action

Answer 3

Origin: Posterior surfaces of ulna & radius and interosseous membrane
Instertion: Lateral side of base of first metacarpal
Innervation: Radial nerve
Main action: Thumb abduction at CMC joint

Question 4

Adductor Brevis Origin, Insertion, Innervation and main action

Answer 4

Origin: Body of Pubis & inferior pubic ramus
Insertion: proximal linea aspera & pectineal line
Innervation: Obturator nerve
Main Action: Hip adduction, some hip flexion

Question 5

Adductor Longus Origin, Insertion, Innervation and main action

Answer 5

*Origin: Body of pubis
*Insertion: Middle 1/3 linea aspera
*Innervation: Obturator nerve
*Main Actions: Hip Adduction

Question 6

Adductor Pollicis Origin Instertion Innervation Main action

Answer 6

Origin:Oblique Head: capitate and base of 2nd & 3rd metacarpals
Transverse Head: Palmar aponeurosis
Instertion: Ulnar side of the proximal phalanx of the thumb
Innervation: Ulnar nerve
Main action: Adducts thumb

Question 7

Anconeus Origin Instertion Innervation Main action

Answer 7

Origin: Lateral epicondyle of the humerus
Instertion: Olecranon process of the ulna
Innervation: Radial nerve
Main action: Elbow extension
Abducts distal ulna during pronation

Question 8

Biceps Brachii Origin Instertion Innervation Main action

Answer 8

Origin: Long head Supraglenoid tubercle of scapula
Short Head Coracoid process of scapula
Instertion: Radial tuberosity
Innervation: Musculocutaneous Nerve
Main action: supination
Elbow flextion
Shoulder flextion

Question 9

Biceps Femoris Origin, Insertion, Innervation and main action

Answer 9

Origin: 2 Heads
* Long- Ischial tuberosity
* Short- Linea aspera
Insertion: Head of the fibula
Innervation: Sciatic nerve
Main Actions: Hip extension, knee flexion,
lateral rotation of a FLEXED knee

Question 10

Brachialis Origin Instertion Innervation Main action

Answer 10

Origin: Anterior humerus 1/3 down shaft
Instertion: Ulnar tuberosity and coronoid process of the ulna
Innervation: Musculocutaneous Nerve
Main action: Elbow flexion

Question 11

Brachioradialis Origin Instertion Innervation Main action

Answer 11

Origin: Lateral supracondylar ridge of the humerus
Instertion: Styloid process of the radius
Innervation: Radial nerve
Main action: Elbow flexion in semi-pronation

Question 12

Coracobrachialis Origin Instertion Innervation Main action

Answer 12

Origin: Coracoid process of scapula
Instertion: Medial shaft of humerus
Innervation: Musculocutaneous Nerve
Main action: Shoulder flexion
Shoulder adduction

Question 13

Deltoid Origin Instertion Innervation Main action

Answer 13

Origin: Anterior portion of lateral 1/3 clavicle
Lateral portion of acromion process
Inferior edge of scapular spine
Instertion: Deltoid tuberosity of humerus
Innervation: Axillary Nerve
Main action: Abduction of shoulder (beyond 15°)
Anterior head- assists with shoulder flexion and medial rotation
Posterior head- assists with shoulder extension and lateral rotation

Question 14

Diaphragm Origin Insertion Innervation Main action

Answer 14

Origin: Sternal- xiphoid process
Costal- inferior surfaces ribs 6-12
Lumbar- medial & lateral arcuate ligaments, L1-L3
Insertion: central tendon
Innervation: Phrenic nerve
Main action: facilitates respiration

Question 15

Dorsal Interossei Origin Insertion Innervation Main action

Answer 15

Origin: The two metacarpals between which it inserts
Insertion: base of respective proximal phalanx
Innervation: Ulnar nerve
Main action: Abduction of digits 2-4