Trunk
Trunk anatomy
Back, thorax, and abdominal wall — the core, respiratory muscles, and vertebral column.
31 structures
Muscles
11Diaphragm
Principal muscle of respiration
MuscleErector spinae
Iliocostalis, longissimus, spinalis
MuscleExternal intercostals
Elevate ribs (inspiration)
MuscleExternal oblique
Outermost flat abdominal muscle
MuscleInternal intercostals
Depress ribs (expiration)
MuscleInternal oblique
Middle flat abdominal muscle
MuscleMultifidus
Deep segmental stabiliser
MuscleQuadratus lumborum
Posterior abdominal wall
MuscleRectus abdominis
The 'six-pack'
MuscleSplenius capitis
Extends and rotates the head
MuscleTransversus abdominis
Deepest flat abdominal muscle
MuscleBones
8Atlas (C1)
First cervical vertebra
BoneAxis (C2)
Second cervical vertebra
BoneSacrum
Five fused vertebrae
BoneSternum
Breastbone
BoneTypical cervical vertebra
C3–C6
BoneTypical lumbar vertebra
L1–L5
BoneTypical rib
Curved flat bone of the thorax
BoneTypical thoracic vertebra
T2–T9
BoneNerves
2Vessels
10Aorta
The body's main artery
VesselCeliac trunk
Artery of the foregut
VesselCommon iliac artery
Terminal branch of the aorta
VesselHepatic portal vein
Carries gut blood to the liver
VesselInferior mesenteric artery
Artery of the hindgut
VesselInferior vena cava
Drains the lower body
VesselInternal iliac artery
Main artery of the pelvis
VesselPulmonary trunk
Carries deoxygenated blood to the lungs
VesselSuperior mesenteric artery
Artery of the midgut
VesselSuperior vena cava
Drains the upper body
Vessel