The high position of the jugular bulb

Area of Science:

• Otolaryngology
• Anatomy
• Surgical Pathology

Background:

• The jugular bulb's proximity to the hypotympanum is a critical anatomical consideration.
• Variations in jugular bulb position can pose surgical risks during otologic procedures.
• Understanding these variations is essential for preventing intraoperative complications.

Purpose of the Study:

• To investigate the anatomical relationship between the hypotympanum and the jugular bulb.
• To determine the incidence and characteristics of a high jugular bulb position.
• To assess the potential surgical risks associated with this anatomical variation.

Main Methods:

• Histological analysis of 815 temporal bones.
• Identification and classification of high jugular bulb positions.
• Evaluation of potential injury sites during common middle ear surgical procedures.

Main Results:

• A high jugular bulb position was identified in 3.5% of the examined temporal bones.
• The condition was more frequent on the right side and rarely bilateral.
• Two distinct localizations (lateral and medial) of the high bulb were observed.
• The bony shell separating the bulb from the middle ear space was thin (0.1-0.3 mm), offering minimal protection.

Conclusions:

• A high jugular bulb presents a significant risk of iatrogenic injury during myringotomy and middle ear surgery.
• Damage can occur during tympanomeatal flap elevation or granulation tissue removal.
• Reinforcement of the bony wall may prevent injury during myringotomy.
• The thin bony shell offers inadequate protection, necessitating heightened surgical awareness.