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In humans, the mandible, or lower jaw, is connected to the temporal bone of the skull via the temporomandibular joint. This is an extremely complex joint which permits movement in all planes. The muscles of mastication originate on the skull and insert into the mandible, thereby allowing for jaw movements during contraction.
The lateral pterygoid muscle (or external pterygoid muscle) is a muscle of mastication. It has two heads. It lies superior to the medial pterygoid muscle. It is supplied by pterygoid branches of the maxillary artery, and the lateral pterygoid nerve (from the mandibular nerve, CN V 3). It depresses and protrudes the mandible. When each muscle ...
Contraction of the lateral pterygoid acts to pull the disc and condyle forward within the glenoid fossa and down the articular eminence; thus, the action of this muscle serves to protrude the jaw, it with the assistance of gravity, and the digastricus muscle also opens the jaw. The other three muscles close the mouth; the masseter and the ...
Note that in this mouth the lower wisdom teeth have been removed, slightly changing the shape of the pterygomandibular ligaments that usually curve and attach to the mandible around them. The pterygomandibular raphe is a tendinous band [2] [3] formed by the buccopharyngeal fascia. It is a paired structure, with one on each side of the mouth. [3]
Torso, Back, right/left transverse process: spinous process: spinous process: posterior branch: 0 1 interspinales lumborum 1-4 Torso, Back, right/left spinous process: spinous process: posterior rami of spinal nerves: extends, flexes, and rotates vertebral column 8 1 interspinales thoracis 1-3 Torso, Back, right/left spinous process: spinous ...
Building muscle means more than going to the gym -- it means lifting, eating, and resting the right way. Here's how to build muscle, according to experts.
The temporalis muscle is covered by the temporal fascia, also known as the temporal aponeurosis. This fascia is commonly used in tympanoplasty, or surgical reconstruction of the eardrum. The temporalis muscle is accessible on the temples, and can be seen and felt contracting while the jaw is clenching and unclenching.
The IRS boosted taxpayer services through Democrats’ Inflation Reduction Act but still faces processing claims from a coronavirus pandemic-era tax credit program and is slow to resolve certain ...