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Pharynx SG

Pharynx and Nasal Cavity

Buccinator Muscle Attachments Posterior: Pterygomandibular raphe. Anterior: Inserts into cheek
Superior pharyngeal constrictor Skeletal muscle that squeezes and compresses the back of the throat to assist in swallowing
Pterygomandibular raphe attachments Has an attachment to the pterygoid hammulus and lower attachment at the medial side of the mandible
Pharyngeal constrictors Superior, middle and inferior. They push into the cavity in front of them. They make a raphe (seam) that runs up and attaches to the base of the skull called the pharyngeal tubercle
Cricopharyngeal muscle Makes a complete ring, acts as a sphincter and always contracted so you don't consistently swallow air. Relaxes when you swallow
What is continuous with the cricopharyngeus muscle? Esophagus
Actions of stylohyoid muscle and stylopharyngeus muscle Stylohyoid: Elevates hyoid. Stylopharyngeus: Elevates pharyngeal apparatus when it contracts
Soft Palate Functions Raises up and closes airway when you are vocalizing. Baby uses soft palate to suck. Closes off nose when drinking
What elevates the soft palate? Levator veli palatine
Areas behind the pharynx Laryngopharynx: Area behind the larynx. Oropharynx: Area behind the mouth. Nasopharynx: Area above the soft palate and behind the nasal cavity
Pharyngeal Wall layers: outside to inside Mucous membrane, Pharygobasilar fascia, pharyngeal constrictors, buccopharyngeal fascia
Pulsion diverticula If pressure builds up it can blow out the sides of the pharynx
What lies posterior and inferior to the pharynx The thyroid and parathyroid glands, recurrent laryngeal nerves and carotid arteries
What makes the aponeurosis of the tensor soft palate? Tensor veli palatini
Pterygoid hammulus Little hook that comes off the medial plate
What innervates the tensor veli palatini muscle? Trigeminal nerve
Pharynotympanic tube Projects itself into the posterior aspect of nasal cavity. Job is to equilibriate the changes of pressure in the chamber. Lined with mucosa. Goes from pharyngeal area to middle ear.
Drainage of Sphenoid sinus Anteriorly below the sphenoethmoidal recess
Superior, middle and inferior conchae Superior and middle nasal conchae are part of ethmoid bone. Inferior is its own bone
Innervation from Trigeminal Sensory fibers from ophthalmic nerve. Maxillary sends sensory fibers: Greater palatine: Hard palate, Lesser palatine and least palatine
Greater petrosal Synapses in the pterygopalatine ganglion
Parasympathetic and Sympathetic Parasympathetic innervates glands. Sympathetic innervates blood vessels (Superior cervical ganglion)
Blood supply Sphenopalatine artery (terminal branch of maxillary artery) is a major artery for the mucosa on the inside of the nose