ch. 7 sutures

sutural bones

(Wormian bones) typically are small, ranging in size from a tiny pebble to a quarter, but they can be much larger most common and numerous in the lambdoid suture. represent independent bone ossification centers. typically disappear as the adjoining bones fuse in adult years

coronal suture

A vertical plane that divides the body into anterior and posterior parts; also called frontal plane. extends across the superior surface of the skull along a coronal (or frontal) plane. It represents the articulation between the anterior frontal bone and the more posterior parietal bones. first to fuse, usually in the late 20s to early 30s

suture

Synarthrosis in which bones are united by a dense regular connective tissue membrane. immovable joints that form the boundaries between the cranial bones intricate interlocking forms form a strong union, or articulation.

occipitomastoid suture

connects the occipital bone with the portion of the temporal bone that houses the mastoid process

saggital suture

extends between the superior midlines of the coronal and lambdoid sutures. It is in the midline of the cranium (along the midsagittal plane) and is the articulation between the right and left parietal bones. fuse in 40s

lambdoid suture

extends like an arc across the posterior surface of the skull, articulating with the parietal bones and the occipital bone fuse in 40s

squamous suture

on each side of the skull articulates the temporal bone and the parietal bone of that side. The squamous (flat) part of the temporal bone typically overlaps the parietal bone. fuse in 60s