Lateral mass of atlas - Mashpedia All-in-One Encyclopedia

Bone: Lateral mass of atlas

First cervical vertebra, or atlas. (Lateral mass labeled at center right.)

Articulation between odontoid process and atlas. (Lateral mass visible at left and right.)
Latin	massa lateralis atlantis
Gray's	subject #21 99

The lateral masses are the most bulky and solid parts of the atlas, in order to support the weight of the head.

Each carries two articular facets, a superior and an inferior.

It is the origin of the obliquus capitis superior and the insertion of the obliquus capitis inferior.

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

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

Rib	specific ribs (1, 2, 9, 10, 11, 12, true – 1–7, false – 8–12, floating – 11–12) 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

proc, drug (M5)

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