25 Skeletal Muscles with Origin, Insertion, Innvervation Function

Question 1

Deltoid

Answer 1

O.) clavicle, acromion of scapula, spine of scapula
I.) tuberosity of humerus
N.) axillary nerve
A.)abduction, rotate, extension, flexion

Question 2

latissimus dorsi

Answer 2

O.) spines T7-L5, crests of sacrum, ribs 9-12
I.) intertubercular sulus of humerus
N.)thoracodorsal nerve
A.) extension, adduction, rotate shoulder

Question 3

trapezius

Answer 3

O.) superior nuchal line of occiptal bone
I.) clavicle & acromion/spine of scapula
N.) C3-C5 Nerves
A.) extension of head

Question 4

biceps brachii

Answer 4

O.) supraglenoid tubercle of scapula, coracoid process of scapula
I.)radial tuberosity
N.) musculocutaneous nerve
A.) flexes, supinates forearm

Question 5

pectoralis major

Answer 5

O.) clavicle, sternum, costal cartilages
I.) intertubercular sulcus of humerus
N.) medial & lateral pectoral nerves
A.) adducts, rotates arm

Question 6

serratus anterior

Answer 6

O.) ribs 1-9
I.) inferior angle of scapula & vertebral border
N.) long thoracic nerve
A.) horizontal arm movement

Question 7

triceps

Answer 7

O.) long head : infragleniod tubercle of scapula, Medial head: lower posterior humerus lateral head: upper posterior humerus
I.) upper surface of olecranon
N.) radial nerve
A.) extends elbow

Question 8

adductor magnus

Answer 8

O.) adductor: ischiopubic ramus, hamstring: posterior ischial tuberosity
I.) adductor: linea aspera hamstring: adductor tubercle
N.) addcutor: L2-4 hamstring: L4-S3
A.) adducts, rotates and extends hip

Question 9

biceps femoris

Answer 9

O.) long head: ischial tuberosity short head: linea aspera & supracondylar ridge of femur
I.) styloid process head of fibula
N.) sciatic nerve
A.) flexes and rotates knee

Question 10

gastronemius

Answer 10

O.) lateral head: lateral condyle of femur medial head: medial condyle above femur
I.) posterior aspect of calcaneous
N.) tibial nerve
A.) flexes foot and knee

Question 11

gluteus maximus

Answer 11

O.) gluteal line, coccyx, sacrum, iliac crest,
I.) gluteal tuberosity of femur
N.) inferior gluteal nerve
A.) extends & laterally rotates hip

Question 12

gracilis

Answer 12

O.) ischiopubic ramus
I.) upper medial shaft of tibia
N.) L2, L3
A.) addcuts hip

Question 13

rectus femoris

Answer 13

O.) straight head: anterior inferior iliac spine reflected head: ilium above acetabelum
I.) tubercle of tibia
N.) L3, L4
A.) extends leg & flexes thigh

Question 14

sartorius

Answer 14

O.) below anterior superior iliac spine
I.) upper medial shaft of tibia
N.) L3, L4
A.) flexes, abducts, laterally rotates hip & flexes, medially rotates knee

Question 15

tibialis anterior

Question 16

masseter

Answer 16

O.) zygomatic and maxilla arch
I.) ramus of mandible
N.)elevates mandible
A.) mandibular nerve V

Question 17

orbicularis oculi

Answer 17

O.) Medial walls of orbit
I.) ciruclar path around orbit
N.) facial nerve VII
A.) close eyelids

Question 18

orbicularis oris

Answer 18

O.)muscles surrounding mouth
I.) skin at corner of mouth
N.) helps with kissing and shapes lips during speech
A.) facial nerve VII

Question 19

sternocleidomastiod

Answer 19

O.) mastoid process, nuchal line
I.) sternal head: manubrium clavicular head: clavicle
N.) C2, C3
A.) rotate, flex, extend head

Question 20

temporalis

Answer 20

O.) temporal bone
I.) cornoid process and ramus of mandible
N.) mandibular nerve V
A.) elevated and retracts the mandible

Question 21

buccinator

Answer 21

O.) alevolar process of maxilla
I.) angle of mouth
N.) facial nerve V
A. helps with whistling/blowing

Question 22

external oblique abdominis

Answer 22

O.) ribs 5-12
I.) iliac crest and linea alba
N.) T7-T12 & iliohypgrastric nerve
A.) compress the abdomen and flexes lumbar vertebral column

Question 23

interal oblique adbdominis

Answer 23

O.) cartilage of ribs 7-10 and thoracomlumbar fascia
I.) iliac crest, linea alba, inguinal ligament
N.) T8-T12 & iliohypogstric nerve & iliioginuinal nerve
A.) compress the abdomen, flex lumbar verterbal column

Question 24

rectus abdominis

Answer 24

O.) xiphoid process & cartilage of ribs 5-7
I.) pubic crest and pubic symphysis
N.) T7-T12
A.) flexes vertebral column and compresses the abdomen

Question 25

diaphragm

Answer 25

O.) central tendon
I.) xiphoid process, costal cartilages
N.) C3-C5 Nerves
A.) flatten the thoracic cavity