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Saccule (Ear)

Dr Daniel J Bell ◉ and Dr Michelle Peterson et al.

The saccule is a small membranous sac, paired with the utricle, within the vestibule of the inner ear. It is part of the membranous labyrinth and has an important role in orientation and balance, particularly in vertical tilt ¹.

On this page:

Article:

Gross anatomy
Arterial supply
Innervation
Radiographic features
Related pathology
See also
Related articles
References

Images:

Cases and figures
Imaging differential diagnosis

Gross anatomy

The vestibule is located within the bony labyrinth (temporal bone) of the inner ear ²,inferior to the semicircular canals ¹. The utricle and the saccule are co-located within the vestibule ³. The saccule lies in the medial wall of the vestibule, near the opening of the vestibular duct of the cochlea in the recessus sphaericus ^1,5. It is smaller in size compared to the utricle and globular in appearance. The saccule is oriented in a vertical plane ².

The saccule communicates with the cochlear duct through the ductus reuniens and it communicates with the utricle via the utriculosaccular duct ⁵.

Within the anterior aspect of the saccule lies a projection known as the macula, the sensory organ of the saccule ². Like the utricle, this sensory epithelium of the saccule is lined by vestibular cells ¹. These cells project into the membranous labyrinth called the statoconial membrane, a gelatinous layer beyond containing otoliths (calcium carbonate particles) ^1,2. Cilia from the hair cells are attached to these otoliths ⁵.

Function

Any change in the orientation of the head results in stimulation of the saccule, via movement in the otolith-cilia-macula complex, releasing signals that the brain interprets ^2,4. The saccule is sensitive to vertical acceleration in comparison to the utricle, which is more sensitive to horizontal acceleration ^2,5. Unlike the utricle, the saccule also provides information about head position even when it is stationary.

Arterial supply

The saccule receives its blood supply from two arteries. The anterior vestibular artery (second branch of the labyrinthine artery) and the posterior vestibular artery both supply the saccule ⁵.

Innervation

The inferior vestibular nerve supplies the saccule. This nerve is a branch of the vestibular nerve, itself a division of the vestibulocochlear nerve (VIII) ⁵.

Radiographic features

The saccule itself is too small to be distinguished on high-resolution CT or MRI ⁶, but sits in the medial portion of the vestibule.

Related pathology

Damage to the otolith-containing organs such as the saccule can result in a reduced ability to sense motion and orientation, leading to vestibular symptoms, e.g. imbalance ⁵.

See also

References

Anatomy: Head and neck

Article information

rID: 61105

System: Head & Neck

Section: Anatomy

Tag: saccule; utricle

Synonyms or Alternate Spellings:

Saccules (ear)

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Inner ear (illustrations)Inner ear (illustrations)

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