Introduction The stapedius muscle is a muscle within the ear that support the stapes bone of the inner ear. It’s the very small skeletal muscle in the body. It plays an important role in hearing. It is Shaped like a sickle, the stapedius muscle is also described as the smallest skeletal muscle in the human…
Introduction Extraocular muscles are essential for ocular movement. The four rectus muscles, superior oblique muscle, and inferior oblique work in conjunction to move the eyes in every direction. The inferior oblique is a thin, narrow eye muscle and belongs to the group of six extraocular muscles or the orbit’s extrinsic muscles. The inferior oblique muscle…
Introduction The musculocutaneous nerve is a terminal branch of the lateral cord of the brachial plexus that carries fibers of cervical spinal nerves five along seven (i.e., C5, C6, & C7). The musculocutaneous nerve leaves the axilla & rapidly descends into the coracobrachialis muscle fibers. The musculocutaneous nerve supplies the biceps brachii & brachialis muscles…
The sacral plexus is a network of nerve fibers that supply the skin & muscles of the pelvis & lower limb. the sacral plexus is present on the surface of the posterior pelvic wall, anterior to the piriformis muscle. The plexus is formed by the anterior rami (divisions) of the sacral spinal nerves S1, S2,…
Introduction The levator palpebrae superioris originates from an inferior surface of the lesser wing of the sphenoid bone, just above an optic foramen. It enlarges and decreases in thickness (becomes thinner) and becomes the levator aponeurosis. This portion is inserted on the skin of the upper eyelid, as well as the superior tarsal plate. It…
What is the Occipitofrontalis Muscle? Occipitofrontalis is a scalp muscle that is long and wide muscle. This muscle and the temporoparietalis are both the epicranial group of the facial expression muscles. The muscles of facial expression enable the face to perform different unique movements, from smiling and frowning to raising one or both eyebrows in…
Introduction There is a total of twenty-three discs within the human spine: six in the cervical region (neck), twelve in the thoracic region (middle back), and five in the lumbar region (lower back). The intervertebral disc (IVD) is the main in the normal functioning of the spine. It is a cushion of fibrocartilage or the…
Muscles of the chest are referred to as “Pecs” muscles. These muscles are Pectoralis Major, Pectoralis minor, Serratus Anterior, and Subclavius. Chest muscles connect the front of the human chest with the bones of the upper arm and shoulder. The pectoral region has four muscles that create movements to the upper limbs or ribs. Pectoralis…
What is the spinal cord? The spinal cord is a long, tube-like band of tissue. It connects the brain to the lower back. the spinal cord carries nerve signals from the brain to the body & vice versa. These nerve signals help you feel sensations & move the body. Any injury or disease to the…
What is the central nervous system simple definition? The central nervous system(CNS) is a combination of the brain & spinal cord. It is referred to as “central” because it combines information from the whole body & coordinates activity across the whole organism. Overview of the brain The nervous system is made up of huge neural…
