QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Describe the location of each of the following muscles.
1. Masseter 2. Sternocleidomastoid 3. Sternohyoid 4. Orbicularis oris 5. Zygomaticus minor 6. Platysma 7. Risorius 8. Temporoparietalis 9. Superior constrictor 10. Digastric
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Answer
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Step 1:
The masseter muscle is located in the lower part of the face, near the angle of the jaw. It is a square-shaped muscle that covers the lower half of the ramus (the vertical part) of the mandible (lower jawbone) and the adjacent part of the zygomatic arch (cheekbone).
Step 2:
The sternocleidomastoid muscle is a large, strap-like muscle that runs diagonally from the sternum (breastbone) and clavicle (collarbone) to the mastoid process (bony prominence behind the ear). It is located on either side of the neck.
Step 3:
The sternohyoid muscle is a thin, strap-like muscle that runs from the sternum and clavicle to the hyoid bone (a U-shaped bone in the neck). It is one of the muscles that make up the anterior triangle of the neck.
Step 4:
The orbicularis oris muscle is a circular muscle that surrounds the mouth. It is responsible for puckering the lips and helping to form facial expressions.
Step 5:
The zygomaticus minor muscle is a small muscle located in the cheek, near the corner of the mouth. It runs from the zygomatic bone (cheekbone) to the angle of the mouth and helps to raise the upper lip.
Step 6:
The platysma muscle is a thin, broad muscle that covers the lower part of the neck and the upper part of the chest. It is located just beneath the skin and helps to depress the lower jaw and wrinkle the skin of the neck.
Step 7:
The risorius muscle is a small muscle located on either side of the mouth. It runs from the cheekbone to the corner of the mouth and helps to draw the corners of the mouth back, producing a smile.
Step 8:
The temporoparietalis muscle is a small muscle located on the side of the head, just above the ear. It is part of the occipitofrontalis muscle, which helps to raise the eyebrows and wrinkle the forehead.
Step 9:
The superior constrictor muscle is one of the three muscles that make up the circular muscle layer of the pharynx (throat). It is located in the upper part of the neck and helps to constrict (narrow) the pharynx during swallowing.
Step 10:
The digastric muscle is a muscle located in the neck, just in front of the sternocleidomastoid muscle. It has two bellies (an anterior and a posterior belly) that are connected by a narrow tendon. The anterior belly runs from the mandible (lower jawbone) to the hyoid bone, while the posterior belly runs from the mastoid process (bony prominence behind the ear) to the hyoid bone. The digastric muscle helps to open the mouth and elevate the hyoid bone during swallowing.
Final Answer
The digastric muscle is a muscle located in the neck, just in front of the sternocleidomastoid muscle. It has two bellies (an anterior and a posterior belly) that are connected by a narrow tendon. The anterior belly runs from the mandible (lower jawbone) to the hyoid bone, while the posterior belly runs from the mastoid process (bony prominence behind the ear) to the hyoid bone. The digastric muscle helps to open the mouth and elevate the hyoid bone during swallowing.
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