Anatomy Practical 4

Frontalis

Temporalis

Orbicularis oculi

Orbicularis oris

Buccinator

Masseter

Platysma

Sternocleidomastoid

Manubrium of sternum, Medial part of clavicle

Origin of sternocleidomastoid

Mastoid process of temporal bone, Lateral ½ of superior nuchal line of occipital bone

Insertion of sternocleidomastoid

Flexion & Lateral Flexion of neck

Action of sternocleidomastoid

External intercostals

Inferior border of ribs 1-11

Origin of external intercostals

Superior border of ribs 2-12

Insertion of external intercostals

Relaxed inspiration & Forced inspiration of Respiratory muscles

Action of external intercostals

Internal intercostals

Superior border of ribs 1-11

Origin of internal intercostals

Inferior border of ribs 2-12

Insertion of internal intercostals

Forced expiration of respiratory muscles

Action of internal intercostals

Diaphragm

Xiphoid process of sternum, Ribs 5-10 and their costal cartilage

Origin of diaphragm

Central tendon of diaphragm

Insertion of diaphragm

Relaxed inspiration and forced inspiration of respiratory muscles

Action of diaphragm

Rectus abdominis

Pubic crest, pubic symphysis

Origin of rectus abdominis

Costal cartilages 5-7, Xiphoid process

Insertion of rectus abdominis

Flexion of trunk

Action of rectus abdominis

External obliques

Ribs, Costal cartilages 5-12

Origin of external obliques

Iliac crest, Linea alba

Insertion of external obliques

Flexion & lateral flexion of trunk

Action of external obliques

Internal obliques

Iliac crest, Inguinal ligament

Origin of internal obliques

Costal cartilage of ribs 7-10, Linea alba

Insertion of internal obliques

Flexion & lateral flexion of trunk

Action of internal obliques

Transverse abdominis

Iliac crest, Inguinal ligament

Origin of transverse abdominis

Linea alba, body of pubis

Insertion of transverse abdominis

Forced expiration of respiratory muscles

Action of transverse abdominis

Iliacus

Iliac fossa, ala of sacrum

Origin of iliacus

Lesser trochanter of femur

Insertion of iliacus

Flexion of hip

Action of iliacus

Psoas major

Body of T12 and L1-L5 vertebrae

Origin of psoas major

Lesser trochanter of femur

Insertion of psoas major

Flexion & lateral flexion of trunk

Action of psoas major

Quadratus lumborum

Iliac crest

Origin of quadratus lumborum

12th rib, transverse processes of L1-L4 vertebrae

Insertion of quadratus lumborum

Lateral flexion & rotation of trunk

Action of quadratus lumborum

Tensor fascia latae

#18

Iliac crest, Anterior superior iliac spine

Origin of tensor fascia latae

Iliotibial tract (band)

Insertion of tensor fascia latae

Abduction of hip

Action of tensor fascia latae

Iliotibial tract

#19

Sartorius

#24

Anterior superior iliac spine

Origin of sartorius

Proximal shaft of tibia

Insertion of sartorius

Hip flexion & knee flexion

Action of sartorius

Gracilis

#27

Body & inferior ramus of pubis

Origin of gracilis

Proximal shaft of tibia

Insertion of gracilis

Hip adduction & knee flexion

Action of gracilis

Adductor magnus

#28

Inferior ramus of pubis & Ischial ramus

Origin of adductor magnus

Linea aspera of femur & Adductor tubercle of femur

Insertion of adductor magnus

Hip adduction

Action of adductor magnus

Adductor longus

#26

Body & Inferior ramus of pubis

Origin of adductor longus

Linea aspera of femur

Insertion of adductor longus

Hip adduction

Action of adductor longus

Adductor brevis

Body & Inferior ramus of pubis

Origin of adductor brevis

Linea aspera of femur

Insertion of adductor brevis

Hip adduction

Action of adductor brevis

Pectineus

Body of pubis & superior ramus of pubis

Origin of pectineus

Proximal shaft of femur

Insertion of pectineus

Hip flexion & adduction

Action of pectineus

What 4 muscles make up the Quadriceps?

Rectus femoris, Vastus lateralis, Vastus intermedius, Vastus medialis

Rectus femoris

#20

Anterior inferior iliac spine & Groove superior to acetabulum

Origin of rectus femoris

Patella

Insertion of rectus femoris

Hip flexion & knee extension

Action of rectus femoris

Vastus lateralis

#21

Lateral side of greater trochanter & Linea aspera

Origin of vastus lateralis

Patella

Insertion of vastus lateralis

Knee extension

Action of vastus lateralis

Vastus intermedius

Deep to #20

Lateral side of shaft of femur

Origin of vastus intermedius

Patella

Insertion of vastus intermedius

Knee extension

Action of vastus intermedius

Vastus medialis

#23

Medial side of intertrochanteric line & Linea aspera

Origin of vastus medialis

Patella

Insertion of vastus medialis

Knee extension

Action of vastus medialis

Tibialis anterior

#33

Anterior shaft of tibia & Interosseous membrane

Origin of tibialis anterior

Medial cuneiform & 1st metatarsal

Insertion of tibialis anterior