Muscles origins & insertions

Question 1

Occipitalis

Answer 1

Origin: Occipital and temporal bones
Insertion: Galea aponeurotica
Function: Pulls scalp posterior

Question 2

Frontalis

Answer 2

Origin: Galea aponeurotica
Insertion: Skin of eyebrows and root of nose
Function: Raises eyebrows and wrinkles forehead

Question 3

Temporalis

Answer 3

Origin: Temporal fossa
Insertion: Coronoid process of madible
Function: Closes jaw

Question 4

Orbicularis Oculi

Answer 4

Origin: Frontal and maxilaary bones
Insertion: Tissue of eyelid
Function: Blinking; squinting

Question 5

Zygomaticus Major

Answer 5

Origin: Zygomatic bone
Insertion: Skin and muscle at corner mouth
Function: Smiling

Question 6

Masseter

Answer 6

Origin: Zygomatic arch and maxilla
Insertion: Angle and ramus of mandible
Function: Elevates mandible

Question 7

Orbicularis Oris

Answer 7

Origin: Arises from maxillae and mandible
Insertion: encircles the mouth
Function: Kissing

Question 8

Platysma

Answer 8

Origin: Fascia of Chest
Insertion: Lower margin of mandible
Function: Depress mandible

Question 9

Sternocleidomastoid

Answer 9

Origin: Manubrium and medial end of clavicle
Insertion: Mastoid process
Function: Head flexion

Question 10

Trapezius

Answer 10

Origin: Occipital bone; spines C7 and T1-12
Insertion: Acromion and spoine of scapula and lateral third of clavicle
Function: Raises and rotates Scapula

Question 11

Deltoid

Answer 11

Origin: Lateral 3rd of clavicle; acromion and spine of scapula
Insertion: Deltoid tuberosity of humerus
Function: Arm abdduction

Question 12

Teres Major

Answer 12

Origin: Posterior surface of scapula at inferior angle
Insertion: Intertubercular sulcus of humerus
Function: Medial Rotates and adducts humerus

Question 13

Teres Minor

Answer 13

Origin: Lateral border of posterior scapula
Insertion: Greater tubercle of humerus
Function: Stabilizes humerus, rotates humerus laterally

Question 14

Infraspinatus

Answer 14

Origin: Infraspinous fossa
Insertion: Greater tubercle of humerus
Function: Stabilizes humerus, rotates humerus laterally

Question 15

Supraspinatus

Answer 15

Origin: Supraspinous fossa
Insertion: Greater tubercle of humerus
Function: Stabilizes humerus, prevents downward dislocation

Question 16

Subscapularis

Answer 16

Origin: Subscapular fossa
Insertion: Lesser tubercle of humerus
Function: rotates humerus medial, stabilizes humerus

Question 17

Pectorlis Major

Answer 17

Origin: Sternum; cartilages of ribs 1-6
Insertion: Greater tubercle of humerus
Function: Arm flexion

Question 18

Pectorlis Minor

Answer 18

Origin: Anterior surface of ribs 3-5
Insertion: Coracoid process of scapula
Function: Scapula forward and downward

Question 19

Latissimus Dorsi

Answer 19

Origin: Spines T6-12, Lumbar, lower 3 ribs, iliac crest
Insertion: Intertubercular sulcus of humerus
Function: Arm extension

Question 20

Serratus Anterior

Answer 20

Origin: Ribs 1-8
Insertion: Anterior surface of vertebral border
Function: Hold scapula against chest wall

Question 21

Rectus Abdominis

Answer 21

Origin: Pubic Crest and symphysis
Insertion: Xiphoid process and ribs 5-7
Function: Flex and rotates lumbar region

Question 22

External Oblique

Answer 22

Origin: outer surface of lower 8 ribs
Insertion: Insert into linea alba
Function: Aid in flexing vertebral column with rectus

Question 23

Internal Oblique

Answer 23

Origin: Lumbar fascia; iliac crest
Insertion: Linea alba; pubic crest
Function: Aid in flexing vertebral column with rectus

Question 24

Transversus Abdominis

Answer 24

Origin: Inguinal ligament;iliac crest; last 6 ribs
Insertion: Linea alba; pubic crest
Function: Compress abdominal contents

Question 25

Triceps Brachii

Answer 25

Origin: Infraglenoid tubercle; Poster shaft Insertion: Olecranon process of ulna Function: Forearm extension

Question 26

Biceps Brachii

Answer 26

Origin: Coracoid process; tubercle of glenoid cavity Insertion: Radial tuberosity Function: Flexes elbow joint

Question 27

Brachioradialis

Answer 27

Origin: Lateral supercondylar ridge Insertion: Base of styloid process Function: Forearm flexion

Question 28

Brachialis

Answer 28

Origin: Front of distal humerus Insertion: Coronoid process of ulna Function: Forearm flexion

Question 29

Gluteus Maximus

Answer 29

Origin: Dorsal ilium; sacrum; coccyx Insertion: Gluteal tuberosity of femur Function: Extensor of thigh

Question 30

Gluteus Medius

Answer 30

Origin: Anterior and posterior gluteal line Insertion: Greater trochanter of femur Function: Abducts and medial rotates

Question 31

Gluteus Minimus

Answer 31

Origin: Anterior and inferior gluteal lines Insertion: Greater trochanter of femur Function: Abducts and medial rotates

Question 32

Tensor Fascia Latae

Answer 32

Origin: Anterior iliac crest; anterior superior iliac spine Insertion: Iliotibial Tract Function: Flexes and abducts thigh

Question 33

Sartorius

Answer 33

Origin: Anterior superior iliac spine Insertion: Medial aspect of proximal tibia Function: Flexes, abducts and laterally rotates thigh

Question 34

Iliotibial tract

Answer 34

Origin: Iliac crest Insertion: knee Function:

Question 35

Rectus Femoris

Answer 35

Origin: Anterior Iliac crest Insertion: Patella and tibial tuberosity Function: Extends knee and flexes hip

Question 36

Vastus Lateralis

Answer 36

Origin: Greater Trochanter Insertion: Patella and tibial tuberosity Function: Extends and stabilizes knee

Question 37

Vastus medialis

Answer 37

Origin: Linea aspera Insertion: Patella and tibial tuberosity Function: Extends knee

Question 38

Vastus Intermedius

Answer 38

Origin: Anterior and lateral surface of proximal femur Insertion: Patella and tibial tuberosity Function: Extends knee

Question 39

Gracilis

Answer 39

Origin: Inferior Ramus and body of pubis Insertion: Inferior to its medial condyle Function: Adducts thigh

Question 40

Adductor longus

Answer 40

Origin: Pubis near pubic symphysis Insertion: Linea aspera Function: Adducts thigh

Question 41

Adductor Magnus

Answer 41

Origin: Ischial and pubic rami and ishcial tuberosity Insertion: linea aspera and adductor tubercle of femur Function: Adducts thigh, medially rotates thigh

Question 42

Iliopsoas

Answer 42

Origin: see iliacus and Psoas Major Insertion: see iliacus and posas major Function: Posture

Question 43

Semitendinosus

Answer 43

Origin: Ischial tuberosity Insertion: medial aspect of upper tibial shaft Function: Extends thigh;flexes knee

Question 44

Biceps Femoris

Answer 44

Origin: Ischial tuberosity Insertion: Lateral condyle of tibia Function: Extends thigh;flexes knee

Question 45

Gastrocnemius

Answer 45

Origin: Medial and Lateral condyles of femur Insertion: Posterior calcaneus via calcaneal tendon Function: Plantar flexion

Question 46

Soleus

Answer 46

Origin: Superior Tibia/fibula Insertion: Posterior calcaneus via calcaneal tendon Function: Plantar flexion

Question 47

Tibalis Anterior

Answer 47

Origin: Lateral condyle and 2/3 of shaft Insertion: Medial cuneiform and 1st metatarsal bone Function: Dorsiflexion

Question 48

Peroneus Longus

Answer 48

Origin: Upper portion of lateral fibula Insertion: First metatarsal and meidal cuneiform Function: Plantar flexion

Question 49

Calcaneal tendon

Answer 49

Origin: Insertion: Function: Achilles Tendon