Demmel U
Anat Anz. 1978;143(5):456-65.
On the right half of the larynx of a 35-year old man a branch of the ramus externus nervi laryngei superioris was described that entered the inner larynx without vessels through a foramen thyroideum. A foramen thyroideum that appears in adults in more than a quarter of the cases is considered on the one hand as a remaining cleft between the fused cartilagineous skeletal elements of the forth and fifth viszeral arch and on the other hand as a occasionally remaining opening on account of a vessel or nerve running through. In more than half the cases vessels and nerves together pass through a foramen thyroideum and in a further third vessels only. If, in the case described, a nerve only passes through the foramen, this nerve, in human beinges, cannot be the nerve of the fifth veszeral arch on account of phylo-and ontogenetic considerations.
在一名35岁男性的喉右侧半部分，发现喉上神经外支的一个分支通过甲状孔进入喉内部，且无血管伴行。甲状孔在超过四分之一的成人病例中出现，一方面被认为是第四和第五内脏弓融合的软骨骨骼元素之间残留的裂隙，另一方面是由于血管或神经穿行而偶尔残留的开口。在超过一半的病例中，血管和神经共同通过甲状孔，另有三分之一的病例只有血管通过。在所描述的病例中，如果只有一条神经通过甲状孔，从系统发育和个体发育的角度考虑，在人类中这条神经不可能是第五内脏弓的神经。
