Answer from the skull inwards. Which is the outermost layer of the cranial meninges? …
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Answer from the skull inwards.
- Which is the outermost layer of the cranial meninges?
- Which is the very thin middle layer?
- Which layer is in contact with the brain tissue?
- Name the two kinds of protection of the brain that a surgeon must pass before she reaches the cortex.
Need a reminder? The key ideaShow
The brain is protected by the skull and the cranial meninges: the dura mater (outer), the arachnoid (thin, middle) and the pia mater (inner, on the brain tissue). The forebrain has the cerebrum (two hemispheres joined by the corpus callosum), the thalamus and the hypothalamus. The cortex is the grey matter, with motor, sensory and association areas. The limbic system has the amygdala and the hippocampus.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The dura mater is the outer layer of the meninges.
Step 2. (b) The arachnoid is the very thin middle layer.
Step 3. (c) The pia mater is the inner layer, in contact with the brain tissue.
Step 4. (d) The surgeon passes the skull (the bone) and then the three layers of the cranial meninges.
Answer: (a) dura mater; (b) arachnoid; (c) pia mater; (d) the skull and the meninges.
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