Comparative anatomical studies on the thyroid and thymic arteries. IV. Rabbit (Oryctolagus cuniculus)

Area of Science:

• Anatomy
• Vascular Biology
• Comparative Anatomy

Background:

• The vascular anatomy of the thyroid and thymus glands is crucial for understanding organ function and potential surgical interventions.
• Previous studies have described variations in these arteries in various species, but rabbit anatomy requires detailed investigation.

Purpose of the Study:

• To comprehensively investigate and document the anatomical variations of the thyroid and thymic arteries in Japanese white strain rabbits.
• To compare the rabbit arterial patterns with those reported in other mammals, including marsupials, rats, humans, and guinea pigs.

Main Methods:

• Dissection and macroscopic observation of the thyroid and thymic arteries in 30 male and 30 female Japanese white strain rabbits.
• Detailed recording of the origin, course, and termination of each identified artery.

Main Results:

• The superior thyroid artery was infrequent (13%), often replaced by an independent superior laryngeal artery (87%).
• The middle thyroid artery was highly constant (99%), originating from the common carotid artery and supplying the thyroid gland.
• The inferior thymic artery (92%) and middle thymic artery (55%) were frequently observed, with diverse origins.
• Rabbit thyroid and thymic arterial systems demonstrated greater complexity than in polyprotodont marsupials, rats, and humans, but simpler thyroid arteries than in guinea pigs.

Conclusions:

• Japanese white strain rabbits possess a complex and variable pattern of thyroid and thymic arteries.
• The observed variations highlight significant differences compared to other mammalian species, particularly in the supply of the thyroid gland.
• This detailed anatomical description provides valuable insights for comparative anatomy and potential research involving rabbit models.