208 



THE STRUCTURE OF MAN 



IV. NERVOUS SYSTEM 



(a) Central Nervous System 



Filum terminale. 



Glandula coccygea. 



Pyramidal tracts. 



Parieto - occipital fissure ("Affens- 



palte"). 



Pineal gland (epiphysis cerebri). 

 Pituitary body (hypophysis cerebri). 



Lobus olfactorius. 



Roof of the fourth ventricle. 



Obex, ligula, vela medullaria, tseniae 



medullares. 



Occipital lobe of cerebrum. 

 Posterior cornu of lateral ventricle. 

 Calcar avis. 



(6) Peripheral Nervous System 



Roots and ganglia of hypoglossus. Traces of teguinental sense organs in 



Rami recurrentes of certain cerebral foetal life. 



nerves. Variations in the brachial and lumbo- 



sacral plexuses. 



V. SENSE ORGANS 



Disappearance of an olfactory ridge 



in the embryo. 

 Papilla palatina and foliata. 

 Jacobson's organ. 

 Vasa hyaloidea (Cloquet's canal). 

 The projectile nose. 

 Orbitalis muscle. 



Levator palpebrae superioris muscle. 



Plica semilunaris. 



Supernumerary lachrymal glands. 



Epicanthus. 



Auditory ossicles (relations to the 



visceral skeletal arches). 

 The middle ear (hyoid visceral cleft). 



VI. ALIMENTARY SYSTEM 



Palatal ridges. 



Milk dentition. 



Indications of a third dentition. 



Wisdom teeth. 



Possible indications of free dental 



papillae before the down-growth of 



the dental ridge. 

 Canine teeth. 

 Outer upper incisors. 

 Cheek teeth (reduction of cusps and 



fangs). 

 Appearance of a third premolar and 



a fourth molar. 

 Sublingua. 



Glandula thyroidea. 



Glandula thymus. 



Foramen ccecum and base of the 



tongue. 



Ductus thyroglossus. 

 Bursse supra- and prsehyoidea. 

 Carotid gland. 

 Bursa pharyngea. 

 Constriction of the stomach. 

 Ciliated epithelium in the oesophagus. 

 Diverticulum ilei. 

 Ccecum. 

 Vermiform appendix. 



VII. KESPIRATORY SYSTEM 



Metamorphosis of the aortic arch Sinus Morgagni (laryngeal resonant 



system. chamber). 



Branchial pouches and cervical fistulae. Sinus and Lobus subpericardiacus. 



