The fetal skull Flashcards
What are the names of the four types of bones that make up the fetal vault (skull)?
Frontal, parietal, occipital and temporal
What bones make up the forehead section?
Frontal
What bones run across the top of the skull, on either side?
Parietal
What bone is at the back of the skull?
Occipital
What bones run down the side of the skull behind the ears?
Temporal
What is the name of the four sutures?
Frontal, coronal, sagittal and lambdoidal
What is the name of the suture that separates the frontal bones?
Frontal (nose to bregma)
What is the name of the suture that separates the frontal bones from the parietal bones?
Coronal
What is the name of the suture that separates the two parietal bones?
Sagittal
What is the name of the suture that separates the parietal bones from the occipital bone?
Lambdoidal
What is the name of the anterior fontanelle?
Bregma
What shape is the anterior (bregma) fontanelle?
Diamond
What is the name of the posterior fontanelle?
Lambda
What shape is the posterior (lambda) fontanelle?
Triangle
Which fontanelle can be felt during a VE if the head is well flexed?
Posterior (Lambda)
What is ‘molding’?
When skull bones cross over each other to allow for descent through the birth canal
What is the diameter of both a suboccipital bregmatic (SOB) and a submentobregmatic (SMB) presentation?
9.5cm
What is the diameter of a suboccipital frontal (SOF) presentation?
10cm
What is the diameter of a submentovertical (SMV) presentation?
11cm
What is the diameter of an occipital frontal (OF) presentation?
11.5cm
What is the diameter of a mentovertical (MV) presentation?
13.5cm
Which is the most favourable presentation?
Suboccipital bregmatic (SOB)
Which is the least favourable presentation?
Mentovertical (MV)
