Angle (rib)

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Angle (rib)

A central rib of the left side. Inferior aspect. (Angle labeled at center top.)
Latin	Angulus costae
Gray's	subject #28 124

The angle of a rib (costal angle) may both refer to the bending part of it, and a prominent line in this area, a little in front of the tubercle.

This line is directed downward and laterally; this gives attachment to a tendon of the iliocostalis muscle.

At this point the rib is bent in two directions, and at the same time twisted on its long axis.

If the rib be laid upon its lower border, the portion of the body in front of the angle rests upon this border, while the portion behind the angle is bent medially and at the same time tilted upward; as the result of the twisting, the external surface, behind the angle, looks downward, and in front of the angle, slightly upward.

The distance between the angle and the tubercle is progressively greater from the second to the tenth ribs. The portion between the angle and the tubercle is rounded, rough, and irregular, and serves for the attachment of the longissimus dorsi muscle.

References

This article incorporates text from a public domain edition of Gray's Anatomy.

Bones of torso (TA A02.2,3, GA 2.96–128)

Vertebra

General structures	body of vertebra vertebral arch (pedicle, lamina, vertebral notch) foramina (vertebral, intervertebral) processes (transverse, articular/zygapophysis, spinous) spinal canal

Cervical vertebrae	Uncinate process of vertebra Transverse foramen Anterior tubercle Carotid tubercle Posterior tubercle C1 (lateral mass, anterior arch, posterior arch) C2 (dens) C3, C4, C5, C6 C7

Thoracic vertebrae	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 costal facets (superior, inferior, transverse) Uncinate process of vertebra

Lumbar vertebrae	L1, L2, L3, L4, L5 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

Thoracic skeleton

Rib	specific ribs (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, True ribs, False ribs, Floating rib) parts (Angle, Tubercle, Costal groove, Neck, Head)

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

Thoracic cage	Superior thoracic aperture Inferior thoracic aperture Intercostal space Costal margin Infrasternal angle

M: BON/CAR

anat (c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug (M5)

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