MEDRADSC 2RA3 Lecture Notes - Lecture 2: Lambdoid Suture, Coronal Suture, Sagittal Suture

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 2RA3
• Professor: Alana Trainor

Document Summary

Occipitomastoid: lies b/n occiput & mastoid portion of the temporal bone. Parietomastoid: b/n parietal bone & mastoid portion of the temporal bone. Sphenosquamosal: b/n sphenoid & squamous portion of temporal bone. Sphenofrontal: b/n greater wing of the sphenoid & the frontal. Sphenoparietal: b/n greater wing of the sphenoid & parietal bone. Across posterior surface of skull separating occipital bone from parietal bones. Begins at superior midline of lambdoidal suture & extends b/n parietal bones down to the coronal suture. Found b/n frontal & parietal bones (sagittal suture ends when it intersects w coronal) Exist in the adult, are called fontanelles in infants (incomplete ossifications) Junction of lambdoid & sagittal sutures (posterior fontanel) In the infant it is called the posterior fontanelle. Closes b/n 1 & 3 months of age. Made of the sphenofrontal, sphenoparietal, sphenosquamosal sutures. Has an h shape to it; weakest part of the skull. At the junction of the 2 parietal bones with the frontal bone.