Joined in 2023 
82 
63 About this deal
It’s also worth noting there are several other contractile cells which resemble smooth muscle cells (either morphologically and/or functionally) however are not classed as such. Examples include: The muscle is innervated by the anterior rami of the spinal nerves C2-C6. Its blood supply stems from branches of the vertebral, inferior thyroid and ascending pharyngeal arteries. All of the infrahyoid muscles are innervated by the ansa cervicalis from the cervical plexus ( C1- C3) [4] [5] except the thyrohyoid muscle, which is innervated by fibers only from the first cervical spinal nerve travelling with the hypoglossal nerve. [1] Function [ edit ] Unipennate, in which the fascicles insert into only one side of the tendon, as in the extensor digitorum longus muscle of the leg; Semispinalis cervicis, that arises from the transverse processes of vertebrae T1-T6 and inserts onto the spinous processes of vertebrae C2-C5.
a b c McHanwell, Steve; Watson, Charles (1 January 2009). "Localization of Motoneurons in the Spinal Cord". The Spinal Cord: 94–114. doi: 10.1016/B978-0-12-374247-6.50011-0. ISBN 9780123742476. The mylohyoid is innervated by the nerve to mylohyoid muscle that arises from the inferior alveolar branch of the mandibular nerve (CN V3). Its blood supply is derived from the sublingual, inferior alveolar and submental arteries. The mylohyoid is a sheet-like muscle that forms the majority of the floor of the mouth. The mylohyoid arises from the mylohyoid line on the inner surface of mandible, and inserts into the mylohyoid raphe and superior aspect of the body of hyoid bone. The sternohyoid is innervated by the anterior rami of the first three cervical spinal nerves via the ansa cervicalis, that arises from the cervical plexus. The muscle is vascularized by the superior thyroid branch of the external carotid artery. If the mandible is fixed, the muscle acts to elevate the hyoid bone and move the larynx and pharynx anterosuperiorly. The geniohyoid thus aids the act of deglutition and voice production.The ascending part is composed of the inferior fibers of trapezius, that originate from the supraspinous ligaments and spinous processes of the vertebrae T4-T12. These fibers pass upwards and laterally to insert onto the lateral apex of the medial end of the scapular spine. Cardiac pacemaker cells (a.k.a. ‘stimulating’ cardiomyocytes, cardiac conducting cells) are highly specialized/modified cardiomyocytes which are capable of generating and carrying contractile signals across the myocardium. These are arranged into nodes ( sinuatrial and atrioventricular), atrioventricular ‘bundles’ (of His) and subendocardiac conducting networks (commonly referred to as Purkinje fibers) to form the conducting system of the heart. The longus colli, also called the longus cervicis, is a long muscle that spans the entire length of the cervical spine and the upper vertebrae of the thoracic spine. It is divided into three parts:
The infrahyoid muscles are four muscles located inferior to the hyoid bone, that connect it to the larynx, sternum and scapula. These include the sternohyoid, omohyoid, sternothyroid and thyrohyoid muscles.Rectus capitis posterior major, that arises from the spinous process of axis and inserts onto the lateral part of the inferior nuchal line. If the mandible is fixed and the muscle is acting from below, it causes an elevation of the hyoid bone and larynx. This results in the closing of the epiglottis, preventing the inhalation of the food bolus during swallowing. Striated muscle can be further subdivided into three classifications based on its location and morphology:
The middle scalene muscle receives its nerve supply from the anterior rami of cervical spinal nerves C3-C8. Its blood supply stems from the ascending cervical branch of the inferior thyroid artery. The nerve supply to the sternothyroid muscle is derived from the ansa cervicalis (C1-C3). Its blood supply stems from the branches of the lingual and superior thyroid arteries. A convergent (a.k.a. triangular) muscle has a broad origin with fascicles converging toward a single tendon of insertion. Such a muscle is triangular or fan shaped. One example is the pectoralis major muscle of the anterior thorax. Skeletal muscle is the most common type of muscle tissue found in the body and consists of highly elongated, multinucleate, non branching cells which are arranged in a parallel manner. Skeletal myocytes often measure several centimeters, or tens of centimeters in length, with the number of nuclei contained within being proportional to their length. They are biologically classified as ‘ syncytia’; cells which are formed by fusion of several smaller, mononuclear cells. In the case of skeletal muscle, the cells which merge to form myocytes are known as myoblasts.Cell-to-cell communication is largely facilitated via gap junctions which are located close to openings in the basement membrane, allowing the regulation and propagation of contractile signals across the smooth muscle tissue. The infrahyoid muscles function to elevate and depress the hyoid bone and larynx during swallowing and speech. [6] This moves the larynx as one unit. [7] See also [ edit ]
The intertransversarii colli are innervated by the anterior and posterior rami of cervical spinal nerves, and vascularized by the occipital, deep cervical and vertebral arteries. The twitching phenomenon that happens in the early stage of sleep is called a hypnagogic massive jerk, or simply a hypnic jerk. It has also been referred to as a sleep start. There has been little research on this topic, but there have been some theories put forth. The muscle is innervated by anterior rami of spinal nerves C1-C3, and vascularized by the ascending pharyngeal artery, ascending cervical branch of the inferior thyroid artery and the muscular branches of the vertebral artery. When you can move the injured area without pain stopping you, try to keep moving it so the joint or muscle does not become stiff. A pharmacist can help with sprains and strainsFor the first couple of days, follow the 4 steps known as RICE therapy to help bring down swelling and support the injury:
Great Deal 
New Comment