Trunk Muscles - Lab Practical #3

Origin: Upper rib

Insertion: lower rib

Function: pull down ribcage, exhaling

Internal Intercostals

Origin: lower rib

Insertion: linea alba

Function: Twist side to side

external abdominal oblique

Origin: Fascia

Insertion: lower ribs

Function: rotate and bend

internal abdominal oblique

Origin: lateral abdomen

Insertion: Linea alba

Function: suppress, sucking in

transversus abdominis

Origin: Pubic bone, front pelvis

Insertion: Xiphoid process and lower rib

Function: pull thoracic cage, bending down

#111 rectus abdominis

Origin:

Insertion: Linea alba

Function: segment abs, 6 pack appearance

#112 tendinous intersection

Origin: Inferior medial, lower rib

Insertion: upper border rib

Function: Expand rib cage, Inhaling

External Intercostal

Origin: Upper rib

Insertion: Scapula

Function: protract shoulder

Serratus Anterior Muscle

Origin: Pubic bone

Insertion: coccyx

Function: support pelvic organs

Levator Ani Muscle

Origin: Lower ribs

Insertion: Central flat tendon

Function: Breathing

Diaphragm

Origin: Pelvis

Insertion: Urethra

Function: Controls urination

External Urethral Sphinder