Depressor Labii Inferioris Muscle
Table of Contents
Depressor labii inferioris Muscle Anatomy
This muscle arises from the oblique line of the mandible, and inserts on the skin of the lower lip, blending in with the orbicularis oris muscle. At its origin, depressor labii is continuous with the fibers of the platysma muscle. Much yellow fat is intermingled with the fibers of this muscle.
Origin
It originates from the oblique line of the mandible, between the symphysis and the mental foramen.
Insertion
It inserts on the skin of the lower lip, blending in with the orbicularis oris muscle.
Nerve supply
The mandibular division of the facial nerve supplies the muscle. This muscle helps to depress the lower lip.
Blood Supply
The inferior labial branch of the facial artery and the mental branch of the maxillary artery supply the muscle.
Action
This muscle acts as a depressor of the lower lip.
Strengthening exercise:
This simple pout exercise targets the depressor labii inferioris and mentalis muscles which help with the downward movement and protrusion of the lower lip. Make a pouting face to draw your lower lip out and downwards. Hold this position for five to ten seconds, then relax. Perform ten repetitions of this exercise at a time for optimal results.
Related pathology
In Bell’s palsy depressor labii inferioris muscle commonly paralysis.
FAQ
The muscles of the buccolabial group’s job are responsible for shaping, positioning, and moving the lips. Within that muscle group, the depressor labii inferioris contracts to draw the lower lip downward and forward.
When you smile, the lower lip moves downward to reveal the lower teeth thanks to the depressor labii inferioris (DLI) muscles.
While the depressor labii inferioris muscle was only innervated by marginal mandibular branches, the depressor anguli oris muscle was innervated by both lower buccal and marginal mandibular facial nerve branches.
Pulling your lower lip out and downward, make a pouting look. Hold this posture for five to ten seconds, then release your tension. For best effects, carry out this motion ten times at once.
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