A section through the C-2 spinal ganglion.
Observe:
1. The communication of the third ventricle with the lateral ventricle through the interventricular foramen.
2. The ophthalmic, maxillary and mandibular branches of the trigeminal nerve and their related parasympathetic ganglia.
3. The orbitosphenoid and alisphenoid of the developing skull.
4. The condensation representing the stapes ossicle in the middle ear area.
5. The relation of cranial nerves IX, X and XI to the internal jugular vein as they emerge from the skull.
Keywords: C-1 dorsal primary ramus (suboccipital nerve), C-1 neural arch (atlas), C-1 ventral primary ramus, C-2 spinal ganglion, abducens nerve (CN VI), alisphenoid, caudal end of adenohypophysis, endomeninx, facial nerve (CN VII), glossopharyngeal nerve (CN IX), hypoglossal nerve (CN XII), hypothalamus, internal carotid artery, internal jugular vein (precardinal), intervertebral foramen, lateral ventricle, mandibular nerve (CN V₃), maxillary nerve (CN V₂), nerve of pterygoid canal, notochord, oculomotor nerve (CN III), ophthalmic nerve and ciliary ganglion, optic groove, orbitosphenoid, otic ganglion, parachordal cartilage, primitive maxillary vein, primordial hippocampal cortex (archipallium), primordial neopallial cortex, pterygopalatine ganglion, rectus capitis posterior muscle, roof of 3rd ventricle, semispinalis capitis muscle, spinal accessory nerve (CN XI), stapedial artery, stapes, striatal ridge, third ventricle, trochlear nerve (CN IV), vagus nerve (CN X)
Source: Atlas of Human Embryos.