The superior portion of the sternum it the ____. glenoid fossa body.pdf

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The superior portion of the sternum it the ____. glenoid fossa body manubrium xiphoid process All of the following are synovial joints except: interphalangeal temporomandibular a tooth in its boney socket elbow shoulder The sella turcica belongs to which bone? Mandible Sphenold Ethmoid Temporal Frontal Solution Answer: 4. The superior portion of the sternum is manubrium. Sternum is the breastbone, which is located in the center of the chest, consists of three parts: the manubrium, the body, and the xiphoid process. 5. All the given joints are synovial joints except a tooth in its bony socket. The synovial joints of bones are characterized by containing joint cavity which is filled with synovial fluid. However, tooth are holds in socket by a ligament. 6. The sella turcica belongs to sphenoid bone. The sella turcica is a depression in the sphenoid bone of the human skull which holds the pituitary gland..

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Article title: Authors: Source (original publication and digest): Why did you pick this article: What was the primary finding and why is this important: Why was this research done: What future work or findings might come from this work: Chapter 12 Muscular system Muscles of Head and neck 1. Scalene muscles The scalene muscles are a group of three pairs of muscles in the lateral neck: scalenus anterior, scalenus medius, and scalenus posterior The scalene muscles are related to the thoracic outlet syndrome i. Scalene anterior: Origin: transverse processes of C3 – C6 Insertion: scalene tubercle of 1st rib Nerve supply: anterior rami of C6 – C8 Action: raises the first rib and bends neck to one side ii. Scalene Medius Origin: transverse processes of C1 – C6 Insertion: upper surface of 1st and 2nd ribs Nerve supply: anterior rami of C3 – C8 Action: raises the first rib and bends neck to one side iii. Scalene Posterior Origin: transverse processes of C5 – C7 Insertion: upper surface of 2nd rib Nerve supply: anterior rami of C7 – C8 Action: raises the second rib and bends neck to one side 2. Sternocleidomastoid/ Sternomastoid It is given the name sternocleidomastoid because it originates from the sternum (sterno) and clavicle (cleido), and inserts into the mastoid process of the temporal bone of the skull. It is also called the sternomastoid muscle. Origin: manubrium sterni + medial portion of the clavicle Insertion: mastoid process of the temporal bone and superior nuchal line Nerve Supply: motor: accessory nerve sensory: cervical plexus Action: Acting alone it tilts head to its own side and rotates it so the face is turned towards the opposite side. Acting together, flexes the neck, raises the sternum and assists in forced inspiration. 3. Infrahyoid or “strap” muscles Strap-like muscles occupy each side of the midline of the neck from the mandible to the manubrium sterni. Between these 2 points lie the hyoid bone, and below it is the Adam’s apple or thyroid cartilage; to them certain muscles gain attachment. They include: Sternohyoid m., Sternothyroid m., Thyro-hyoid m. and Omohyoid muscles. These four muscles, also known as the "strap" muscles, function to depress the hyoid bone and larynx during swallowing and speaking (except for Thyrohyoid). i. Sternohyoid Origin: Posterior surface of manubrium sterni, adjoining parts of clavicle and the posterior sternoclavicular ligament Insertion: Medial part of lower border of hyoid bone Nerve supply: Ansa cervicalis Action: Depresses/ stabilizes hyoid bone ii. Sternothyroid Origin: Posterior surface of manubrium sterni and adjoining part of first costal cartilage Insertion: Oblique line of thyroid cartilage Nerve supply: Ansa cervicalis Action: Depresses/ stabilizes thyroid cartilage iii. Thyrohyoid Origin: Oblique line of the thyroid cartilage Insertion: Lower border of the body and the greater cornu of the hyoid bone Nerve supply: Cervical spinal nerve 1 via the hypoglossal nerve Action.

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