Costal margin

Costal margin
Anterior surface of sternum and costal cartilages. (The costal margin forms a large upside-down V on the inferior border.)
Details
Identifiers
Latin	arcus costalis
Dorlands /Elsevier	a_58/12150537
TA	A02.3.04.006
FMA	7569
*Anatomical terminology* [edit on Wikidata]

The costal margin is the lower edge of the chest (thorax) formed by the bottom edge of the rib cage.

Sometimes referred to as the costal arch, it is the medial margin formed by the false ribs and one true rib—specifically, from the seventh rib to the tenth rib.

External links

Anatomy figure: 35:01-03 at Human Anatomy Online, SUNY Downstate Medical Center—"Bony landmarks of the abdomen"
Atlas image: abdo_wall60 at the University of Michigan Health System

Bones of torso

Vertebrae

General structure	Body Arch pedicle lamina notch Vertebral foramen Intervertebral foramina Processes transverse articular spinous Spinal canal

Cervical vertebrae	Uncinate process of vertebra Transverse foramen Anterior tubercle Carotid tubercle Posterior tubercle Atlas lateral mass anterior arch posterior arch Axis dens Vertebra prominens

Thoracic vertebrae	Costal facets superior inferior transverse Uncinate process of vertebra

Lumbar vertebrae	Processes accessory mammillary

Sacrum	Base sacral promontory Ala of sacrum Lateral surface sacral tuberosity Pelvic surface anterior sacral foramina Dorsal surface posterior sacral foramina Median sacral crest Medial sacral crest Lateral sacral crest Sacral canal sacral hiatus

Coccyx	Coccygeal cornu

Thorax

Rib cage	Ribs true ribs false ribs floating ribs Parts angle tubercle costal groove neck head

Sternum	Suprasternal notch Manubrium Sternal angle Body of sternum Xiphisternal joint Xiphoid process

Thoracic cage	Thoracic inlet Thoracic outlet Intercostal space Costal margin Infrasternal angle

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