Muscle Oia: Head And Neck

1. What is the origin, insertion, and action of the sternocleidomastoid muscle?

Origin: Fibula and Tibia; Insertion: Calcaneus; Action: Dorsiflexes foot.

Origin: Radius and Ulna; Insertion: Sternum; Action: Flexes knee.

Origin: Scapula and Humerus; Insertion: Mandible; Action: Extends elbow.

Origin: Sternum and Clavicle
Insertion: Mastoid process of the temporal bone
Action: Laterally rotates head; flexes neck

The sternocleidomastoid muscle originates from the Sternum and Clavicle, inserts into the Mastoid process of the temporal bone, and its main actions are laterally rotating the head and flexing the neck.

Explanation

The sternocleidomastoid muscle originates from the Sternum and Clavicle, inserts into the Mastoid process of the temporal bone, and its main actions are laterally rotating the head and flexing the neck.

2. What is the origin and insertion of the masseter muscle, as well as its primary action?

Origin: Lateral pterygoid plateInsertion: Hyoid boneAction: Protracts mandible

Origin: Zygomatic arch
Insertion: Lateral ramus and angle of mandible
Action: Elevates mandible; prime mover of closing jaw

Origin: MandibleInsertion: Zygomatic archAction: Retracts mandible

Origin: Temporal boneInsertion: MandibleAction: Depresses mandible

The masseter muscle originates from the zygomatic arch, inserts into the lateral ramus and angle of the mandible, and its primary action is to elevate the mandible as the prime mover of closing the jaw.

Explanation

The masseter muscle originates from the zygomatic arch, inserts into the lateral ramus and angle of the mandible, and its primary action is to elevate the mandible as the prime mover of closing the jaw.

3. What is the origin, insertion, and action of the Temporalis muscle?

Origin: Sternum, Insertion: Clavicle, Action: Arm abduction.

Origin: Occipital bone, Insertion: Temporal bone, Action: Head rotation.

Origin: Temporal fossa
Insertion: Coronoid process of mandible
Action: Closes jaw

Origin: Zygomatic arch, Insertion: Hyoid bone, Action: Swallowing.

The Temporalis muscle originates from the temporal fossa, inserts into the coronoid process of the mandible, and its main action is closing the jaw.

Explanation

The Temporalis muscle originates from the temporal fossa, inserts into the coronoid process of the mandible, and its main action is closing the jaw.

4. What is the function of the orbicularis oculi muscle?

Origin: Temporal bone Insertion: Mandible Action: Chewing food.

Origin: Sacrum Insertion: Femur Action: Walking.

Origin: Frontal and maxillary bones
Insertion: Tissue of eyelid
Action: Closes eye

Origin: Clavicle Insertion: Sternum Action: Breathing.

The orbicularis oculi muscle is responsible for closing the eye and is located around the eye socket, originating from the frontal and maxillary bones and inserting into the tissue of the eyelid.

Explanation

The orbicularis oculi muscle is responsible for closing the eye and is located around the eye socket, originating from the frontal and maxillary bones and inserting into the tissue of the eyelid.

5. What is the origin, insertion, and action of the orbicularis oris muscle?

Origin: Temporal bone, Insertion: Hyoid bone, Action: Opens mouth

Origin: Femur, Insertion: Tibia and fibula, Action: Flexes knee

Origin: Clavicle, Insertion: Sternum, Action: Elevates shoulders

Origin: Maxilla and mandible
Insertion: Encircles mouth
Action: Closes lips

The orbicularis oris muscle is responsible for closing the lips and is located in the face, not the other parts of the body mentioned in the incorrect answers.

Explanation

The orbicularis oris muscle is responsible for closing the lips and is located in the face, not the other parts of the body mentioned in the incorrect answers.