**Question:** All of the following are Digastric muscles, Except:

A. M. Longus Colli
B. M. Longus Capitis
C. M. Sternocleidomastoideus
D. M. Sternohyoid

**Core Concept:**
Digastric muscles are a group of two paired muscles in the neck, responsible for the depression of the mandible (lower jaw) and the elevation of the hyoid bone. The two digastric muscles are:
1. M. Digastricus Superior (Sternohyoid)
2. M. Digastricus Inferior (Stapedius)

**Why the Correct Answer is Right:**
Digastricus Superior (Sternohyoid) is the correct answer, as it is not a part of the digastric muscle group. The digastric muscles consist of two parts:

1. M. Digastricus Superior (Sternohyoid): This muscle is also known as the Sternohyoid muscle, and it is not a digastric muscle. It is a triangular muscle situated on the anterior surface of the sternocleidomastoid muscle. Its primary function is to elevate the hyoid bone and assist in depressing the mandible.
2. M. Digastricus Inferior (Stapedius): This is the correct answer as it is part of the digastric muscle group. It is a small, triangular muscle located on the posterior surface of the sternocleidomastoid muscle. Its primary function is to assist in closing the glottis during phonation and the contraction of the stapedius muscle reduces the amplitude of sound vibrations in the middle ear.

**Why Each Wrong Option is Incorrect:**

A. **M. Longus Colli (Longus Capitis)**: This muscle is part of the occipital muscles and is not associated with the digastric muscles. Its primary function is to flex the head and neck, which is not related to the primary function of the digastric muscles.

B. **M. Longus Capitis**: Like option A, this muscle is also part of the occipital muscles and is unrelated to the digastric muscles. Its function is to flex the head and neck, which is not related to the primary function of the digastric muscles.

C. **M. Sternocleidomastoid (SCM)**: The sternocleidomastoid is a large, paired muscle that crosses the neck, attaching to the sternum, cleithrum, and mastoid process of the temporal bone. It is not a part of the digastric muscles and has a different function, facilitating rotation of the head from side to side.

D. **M. Sternocleidomastoid (SCM)**: Similar to options C, the sternocleidomastoid is a large, paired muscle that crosses the neck, attaching to the sternum, cleithrum, and mastoid process of the temporal bone. It is not a part of the digastric muscles and has a different function, facilitating rotation of the head from side to side.

**Clinical Pear