Introduction Semispinalis Capitus belongs to the semispinalis group of the muscle, which in turn is part of the Transversospinal group of muscles (It is formed of muscles between a spinous process and the transverse process of the vertebrae below). The semispinalis muscles have the longest fascicles of the transversospinalis group of the muscles, spanning six…
Introduction Stapedius is the smallest muscle of the human body, measuring approximately 6 mm in length. It is situated in the tympanic cavity in the middle ear, connecting the pyramidal eminence of the petrous part of the temporal bone to the posterior aspect of the neck of stapes. its purpose is to stabilize the smallest…
Introduction The sternohyoid muscle is a flat muscle located on both sides of the neck.The sternohyoid muscle is a strap-like infrahyoid muscle that connects the hyoid bone with the clavicle and sternum. Along with the omohyoid muscle, it comprises the superficial plane of infrahyoid muscles, while the sternothyroid and thyrohyoid muscles belong to the deep…
Introduction The stylohyoid muscle is a paired muscle located in the anterior triangle of the neck.Stylohyoid muscle is a small slender muscle, that lies on the upper border of the posterior digastric muscle. It is part of the suprahyoid group of the muscle which connects the hyoid bone to the mandible and skull. There is…
Introduction Geniohyoid muscle is a short and narrow muscle that lies above the medial part of the mylohyoid muscles. The Geniohyoid muscle is a short, paired muscle that belongs to the suprahyoid muscle group of the neck. Together with the digastric, stylohyoid, and mylohyoid muscles, it makes the floor of the oral cavity. The geniohyoid…
Introduction of the Spinalis Cervicis The Spinalis group of the muscle is part of the erector spinae (ES) group (the intermediate layer of the intrinsic back muscles). Spinalis Cervicis muscle is the cervical portion of the spinalis muscle with spinalis capitis muscle superiorly and spinalis thoracis muscle inferiorly.The Spinalis Cervicis muscle is variably present. Origin:…
Introduction of the suprahyoid muscles The suprahyoid muscles are the digastric, the stylohyoid, the mylohyoid, and the geniohyoid. They all are pharyngeal muscles, with the exception of the geniohyoid muscle.They are described below. The digastric muscle The digastric muscle lies below the body of the mandible, and extends, in a curved form, from the mastoid…
Introduction The digastric muscle lies below the body of the mandible, and extends, in a curved form, from the mastoid notch to the mandibular symphysis. It belongs to the suprahyoid group of the muscles. This muscle is so called because it has 2 bellies. Both the bellies are united by an intermediate tendon. Origin anterior…
Introduction The mylohyoid muscle is one of the suprahyoid muscles.The mylohyoid muscle is a flat, triangular muscle lying deep in the anterior belly of the digastric. Both the sides of the mylohyoid muscles together form the floor of the mouth. Along with the other suprahyoid muscles (the digastric, the geniohyoid, and the stylohyoid), The mylohyoid…
Introduction The lateral pterygoid muscle has two heads the upper head and the lower head.The lateral pterygoid is the fan-shaped muscle located laterally in the infratemporal fossa of the skull. It is one of the four mastication muscles, along with the medial pterygoid muscle, temporalis, and masseter muscles. All these mastication muscles act upon the…
