Depressor septi nasi muscle

Depressor septi nasi muscle is a facial muscle located in the nose region. It plays a crucial role in the movement and control of the nasal tip. In this article, we will explore the anatomy, function, and clinical significance of the depressor septi nasi muscle.

Anatomy

The depressor septi nasi muscle is a small, triangular muscle located in the lower part of the nose. It arises from the maxilla bone, specifically from the incisive fossa, which is a depression on the maxilla. The muscle fibers then extend upwards and attach to the nasal septum, which is the cartilaginous structure that divides the nasal cavity into two halves.

Function

The main function of the depressor septi nasi muscle is to depress or lower the nasal tip. When the muscle contracts, it pulls the nasal septum downwards, causing the tip of the nose to move in a downward direction. This action is important in facial expressions such as sadness or frowning, as it contributes to the drooping appearance of the nose.

Clinical Significance

The depressor septi nasi muscle has clinical significance in various medical and cosmetic procedures. Here are a few examples:

1. Rhinoplasty: During a rhinoplasty procedure, the depressor septi nasi muscle may be addressed to achieve desired changes in the nasal tip position. Surgeons may weaken or reposition the muscle to alter the shape and projection of the nose.

2. Botox Injections: Botox, a neurotoxin, can be injected into the depressor septi nasi muscle to temporarily weaken its activity. This can be useful in correcting a drooping nasal tip or reducing the appearance of a gummy smile.

3. Facial Paralysis: In cases of facial paralysis, the depressor septi nasi muscle may be affected, leading to asymmetry or abnormal movement of the nose. Rehabilitation techniques, such as physical therapy or electrical stimulation, can be employed to restore muscle function.

Related Muscles

The depressor septi nasi muscle works in conjunction with other muscles in the nose region to control facial expressions and nasal movements. Some related muscles include:

1. Nasalis Muscle: The nasalis muscle is responsible for flaring the nostrils. It works in opposition to the depressor septi nasi muscle, as contraction of the nasalis muscle elevates the nasal tip.

2. Procerus Muscle: The procerus muscle is located between the eyebrows and contributes to facial expressions such as frowning or wrinkling the forehead. It also assists in depressing the nasal tip.

References

1. Gray's Anatomy: The Anatomical Basis of Clinical Practice, 41st Edition. 2. Depressor Septi Nasi Muscle. (n.d.). Retrieved from [1](https://www.ncbi.nlm.nih.gov/pubmed/31348462) 3. Rhinoplasty. (n.d.). Retrieved from [2](https://www.plasticsurgery.org/cosmetic-procedures/rhinoplasty)

See Also

• Nasalis muscle
• Procerus muscle
• Rhinoplasty
• Botox injections
• Facial paralysis

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