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…
Introduction of the Temporalis muscle In anatomy, the temporalis muscle is also known as the temporal muscle. This muscle fills the temporal fossa. The temporalis muscle is a thin, fan-shaped muscle located within the temporal fossa of the skull. Along with the medial pterygoid muscle, lateral pterygoid, and masseter muscles, it belongs to the group…
Introduction The masseter is a quadrilateral muscle that covers the lateral surface of the ramus of the mandible. The masseter muscle fibres are arranged in three layers. The masseter muscle is a paired, strong, thick, and rectangular muscle that originates from the zygomatic arch and extends down to the mandibular angle. It contains a superficial…
Introduction The medial pterygoid is a thick, quadrilateral muscle of the face and it has a small superficial head and a large deep head which forms the major part of the muscle.The medial pterygoid muscle is supplied by the mandibular branch of the trigeminal nerve (V). It is important in mastication (chewing). It belongs to…
Introduction Semispinalis Cervicis 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 vertebrates transverse process below). The semispinalis muscles have the longest fascicles of the transversospinalis group of the muscles, spanning six segments. The…
Introduction The semispinalis thoracis muscle contains thin, narrow, fleshy fasciculi, interposed between tendons of considerable length. Semispinalis thoracis muscle consists of five fascicles bridging over five to six vertebral levels between the transverse and spinous processes of certain cervical vertebrae and thoracic vertebrae. With these attachments, semispinalis thoracis muscle aids several movements of the vertebral…
Introduction Splenius cervicis muscle is a paired back muscle found in the prevertebral space of the neck (Muscles on Back Of Neck). The Splenius cervicis muscle is one of the deep muscles of the cervical and thoracic spine. Its fibers run superiorly and laterally. It assists in ipsilateral(same side) cervical side flexion and rotation when…
