Fetal skull Flashcards
List the three components of the fetal skull
The face
The base
The vault
Which two skull components interstate?
The face
The base
Which parts of the skull are not part of the moulding process of labour?
The face and base
Because they are unable to reduce at all
Where is the vault?
The area of the skull from the orbital ridges to the snow of the neck
Which bones does the vault include?
The occiput, the vertex, the brow
The brow is also referred to as?
The sinciput
In cephalic presentation which the the presenting part?
The vertex
What is the denominator of the vertex presentation?
The occiput
Draw and label a skull
Face (bottom of chin starts)- brow brow starts)- vertex (anterior fontanelle starts)- occiput (posterior fontanelle starts) Temporal bone Parietal bones Frontal bone Occipital bone Coronal suture Saggital suture Squamous suture Lambdoid suture Anterior fontanelle Posterior fontanelle
Frontal suture
Goes from anterior fontanelle to nose
What are sutures?
Soft fibrous tissues linking skull bones
What features of the skull enable moulding to take place?
The sutures
What is a fontanelle?
A membranous, non ossified area of the skull where three or more sutures meet
Anterior fontanelle is also known as?
Bregma
Suboccipitofrontal (SOF) diameter
10cm
Suboccipitofrontal (SOF) delivery?
Deflexed head- breech
Suboccipitofrontal (SOF) Location?
Occiput centre to frontal suture centre
Submentobregmatic (SMB) delivery?
Face presentation - face fully extended
Submentobregmatic (SMB) location
Occiput to anterior fontanelle
Submentovertical (SMV) delivery?
Face presentation
Head not fully extended
Submentovertical (SMV) location?
Chin to highest point of vertex
Submentobregmatic (SMB) diameter
9.5cm