. Quain's Elements of anatomy. cesses are larger and project farther outwards than those of thesubjacent vertebrae. They are flattened from above downwards, and have a largeforamen. Their extremities are not bifid, but broad and rough. Varieties.—The posterior arch of the atlas is sometimes imperfect, the gap in the bonebeing bridged across by a fibrous band. A similar defect in the anterior arch is comparativelyrare, but its complete absence has been observed.^ The transverse process, especially theanterior bar, may also be the seat of defective ossification, and the foramen of the vertebrala
. Quain's Elements of anatomy. cesses are larger and project farther outwards than those of thesubjacent vertebrae. They are flattened from above downwards, and have a largeforamen. Their extremities are not bifid, but broad and rough. Varieties.—The posterior arch of the atlas is sometimes imperfect, the gap in the bonebeing bridged across by a fibrous band. A similar defect in the anterior arch is comparativelyrare, but its complete absence has been observed.^ The transverse process, especially theanterior bar, may also be the seat of defective ossification, and the foramen of the vertebralartery is then completed by ligament. A bony arch over the vertebral groove is frequently metwith. Less common is the formation of a canal for the vertebral artery on the outer side ofthe superior articular process. The second vertebra or axis (vert, dentata) forms a pivot on which thefirst vertebra rotates carrying the head. The tody is characterized by the presence of a large blunt tooth-like process called ODONTOID PROCESS.
Size: 1762px × 1417px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectanatomy
