MSK Lecture Head PDF

Musculoskeletal System Anatomy of the Head HSC1008 Dr Karthik Harve & Dr Frank Voon  Sternohyoid, omohyoid, sternothyroid and thyrohyoid...

Musculoskeletal System Anatomy of the Head HSC1008 Dr Karthik Harve & Dr Frank Voon  Sternohyoid, omohyoid, sternothyroid and thyrohyoid are infrahyoid Hyoid bone muscles. Thyrohyoid Sternohyoid The infrahyoid muscles depress the hyoid bone. Thyroid Sternothyroid cartilage Thyrohyoid elevates the larynx. Sternothyroid depresses the larynx. Omohyoid The pterion is formed by parts of the sphenoid, and frontal, parietal, temporal bones. Pterion The temporal lobe Motor cortex processes sensory Sensory cortex information related to hearing, language Parietal lobe Frontal lobe recognition, and memory formation. Occipital Sight lobe Temporal lobe Cerebrospinal fluid (CSF) flows from the two lateral ventricles into the third ventricle, and then the fourth ventricle ventricle The oculomotor nerve, trochlear nerve, and abducent nerve are motor nerves that innervate the extraocular muscles which move the eyeball.  Movements of the arytenoid cartilages on Epiglottis the cricoid cartilage enables the production of speech. Thyroid cartilage Cricoid Cricoid cartilage cartilage The four paranasal sinuses are the frontal, maxillary, ethmoidal and sphenoidal sinuses. The frontal, maxillary, ethmoidal and sphenoidal sinuses are located in the frontal bone, maxilla, ethmoid and sphenoid.  The trigeminal nerve is the fifth (V) cranial nerve. The trigeminal nerve gives off three branches to the skin of the face. The trigeminal nerve gives off the ophthalmic nerve (V1), maxillary nerve (V2), and mandibular nerve (V3). The mandibular nerve also gives off motor fibers to supply the muscles of mastication.  Muscles of mastication Temporalis Masseter Temporalis Medial pterygoid Lateral pterygoid Temporalis, masseter and the medial pterygoid elevate the mandible. The lateral pterygoid depresses the mandible. Muscles of facial expression frontalis orbicularis oculi orbicularis oris buccinator platysma Injury to the facial nerve (lower motor neuron lesion) leads to facial palsy in a patient. The facial muscles on the same side of the lesion are paralysed.