1. External Brain Anatomy
These three membranes are labeled from superficial to deep as follows:
The outermost dura mater (tough mother) forms a sac that encloses the entire brain and spinal cord.
The middle covering is a delicate avascular covering
called the arachnoid mater. It is attached to the inside
of the dura and forms the roof of the subarachnoid space (SAS) in which cerebral spinal fluid (CSF) circulates.
The transparent pia mater is pressed-up against the cord and is filled with blood vessels that supply nutrients to it.
Deep to the dura mater is the arachnoid. This layer has an appearance of cobwebs (hence the name) and its interstices are filled with fluid to act as a shock-absorbing cushion between the brain and the hard cranial case. There are blood vessels running through.The pia mater is not easily visualized because it is so thin and delicate. It is the innermost of the meninges, pressed up against every curve and convolution of the cord and brain.

2. Epidural Anesthesia
Epidural anesthesia is commonly administered to women about to go into labor. In this procedure, a needle is placed between the bones of the posterior spine until it just penetrates the ligamentum flavum yet remains superficial to the dura mater.
Local anesthetic is used to provide pain relief –
even complete anesthesia if a cesarean section is required.

3. Lumbar Puncture
The site used for most lumbar punctures is between the 3rd and 4th (or 4th and 5th) lumbar vertebrae - below the termination of the actual cord in the region of the cauda equina. With the needle in the SAS, CSF can be sampled.
Anesthetics can also
be given in this way,
but using 1/10 the
dose required for
epidural anesthesia.

4. Peripheral Nerves
31 left-right pairs of spinal nerves emerge from the cord at regular intervals (called segments). Except for the first cervical pair the spinal nerves leave the vertebral column from the intervertebral foramen between adjoining vertebrae – the first pair leaves between the
skull and the first cervical vertebrae .
Cervical – 8 pairs, C1-C8
Thoracic – 12 pairs, T1-T12
Lumbar – 5 pairs, L1-L5
Sacral - 5 pairs, S1-S5
Coccygeal – 1 nerve pair

5. Epidural hematoma
a type of traumatic brain injury in which a buildup of blood occurs between the dura mater and the skull.
Source: Wikipedia

8. Lucid Interval
a temporary improvement in a patient's condition after a traumatic brain injury, after which the condition deteriorates. A lucid interval is especially indicative of an epidural hematoma. An estimated 20 to 50% of patients with epidural hematoma experience such a lucid interval.
Source: Wikipedia

9. On Old Olympus Tiny Top A Friendly Viking Grew Vines And Hops
Cranial Nerves
There are 12 Cranial Nerves:
On Old Olympus Tiny Top A Friendly Viking Grew Vines And Hops

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Cranial Nerves (L3)
Some are Sensory, some are Motor and some are both:
Some Say Marry Money But My Brother Says Big Brains Matter Most

11. Cranial Nerves I, II, and III
Olfactory nerve (I)
Optic nerve (II)
Oculomotor (III)

12. Cranial Nerves IV - VIII
Trochlear (IV)
Trigeminal (V)
Abducens (VI)
Facial (VII)
Vestibulocochlear (VIII)

13. Glossopharyngeal (IX) Vagus (X) Accessory (XI) Hypoglossal (XII)
Cranial Nerves IX - XII
Glossopharyngeal (IX)
Vagus (X)
Accessory (XI)
Hypoglossal (XII)