HUBS2103 Lecture Notes - Lesser Wing Of Sphenoid Bone, Cranial Nerves, Ethmoid Bone
1 Jul 2018
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Skull bones
The Skull
• Axial skeleton
• Includes '22 bits'
• Divided into:
1. Neurocranium
o Cranial vault (protects brain)
o Membranous & cartilaginous parts
2. Viscerocranium
o Jaw, ear, neck
o During growth, this grows faster than #1
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Sutures of the skull:
• Coronal suture is between frontal and parietal bones
• Sagittal suture is between two parietal bones
• Metopic suture is in middle of frontal bone
• Lambdoid suture is between parietal and occipital bones
• Squamous is between parietal and temporal bones
Fossa of the brain
1. Anterior Cranial Fossa
o Frontal bone
o Ethmoid bone
• Cribriform plate
▪ Foramina- sense of smell
▪ Crista galli
▪ CN 1
▪ Olfactory sense
o Lesser wing of sphenoid
o pituitary gland
o Optical canal (optic nerve)
o sella turcica- Turkish saddle
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o The jugum sphenoidale i both Eglish ad Lati jugu eaig yoke is a plae that
forms the anterior portion of the sphenoid bone of the skull, and unites its two lesser wings
at the midline.
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Document Summary
Coronal suture is between frontal and parietal bones. Metopic suture is in middle of frontal bone. Lambdoid suture is between parietal and occipital bones. Fossa of the brain: anterior cranial fossa. Notochord evokes ectoderm to develop into neural plate (cns) Lateral edges form neural tube (neural plate-> neural fold -> neural tube) After neural tube formation, three layers can be identified: Presumptive ependymal layer/ ventricular layer: mantle layer (grey matter as it contains cell bodies, marginal layer (outer) (axons will grow into this layer, hence meaning it will be white matter) The ventricular zone is the major proliferative layer and also the first layer of the forming neural tube to appear. The second layer to form is the marginal layer, followed by the mantle layer. Early in development, the wall of the neural canal becomes thickened, in part, by the formation of young or immature neurons that have yet to completely differentiated (sometimes called neurocytes) in the mantle layer.
