Journal of Anatomy and Physiology, Volum 39

abdominal adult amphibian Anatomy angle animal appearance arises arrangement artery articular aspect attached beams become body bone branches canal cavity cells centre close common complete condition cones connection considered continuous corresponding cranial nerves deep derived described diaphragm direct dorsal elements evidence examined existence external fact fibres function further give glands head human important inner inserted internal lateral layer length limb lower lumbar lung mammals margin marked middle muscle muscular nature nerve nervous Norma nuclei observed occurs organs origin outer passes pectoral pectoralis major portion position posterior present primitive probably processes regard region relation remains represented reticulum retinal rods roots sagittal suture seen segment sensory separate shown side skull spinal stage structure superior supply surface suture tendon tissue upper usually variation ventral vertebrate wall whole