Head and Neck Assessment, With Vision and Hearing Basics

Anatomy and Structural Components of the Head

Skeletal Structures of the Cranium and Face
    * Bony Landmarks:
        * Frontal bone: Forms the forehead and the roof of the orbits.
        * Parietal bones: Pair of bones forming the bulk of the cranial vault top and sides.
        * Temporal bones: Located on the sides and base of the skull; includes the Mastoid process, a prominent bony projection behind the ear.
        * Occipital bone: Forms the back and base of the skull; contains the External occipital protuberance.
        * Sphenoid bone: Butterfly-shaped bone at the base of the skull.
        * Ethmoid bone: (Contextual skeletal structure of the facial/cranial area).
    * Cranial Sutures (Fibrous Joints):
        * Coronal suture: Connects the frontal bone with the parietal bones.
        * Sagittal suture: Connects the two parietal bones along the midline.
        * Lambdoidal suture: Connects the parietal bones with the occipital bone.
        * Squamosal suture: Connects the temporal bone with the parietal bone.
    * Facial Skeleton Bones:
        * Nasal bone: Forms the bridge of the nose.
        * Zygomatic bone: The cheekbone.
        * Maxilla: The upper jaw bone.
        * Mandible bone: The lower jaw bone.
Musculature of the Head
    * Functions: Facial muscles enable essential activities including chewing (mastication), speaking, smiling, and frowning.
    * Major Muscles and Tendons:
        * Epicranial aponeurosis (tendon): A tough layer of dense fibrous tissue covering the upper part of the cranium.
        * Frontalis: Muscle of the forehead.
        * Temporalis: Muscle involved in closing the jaw.
        * Orbicularis oculi: Ring-like muscle surrounding the eye.
        * Nasalis: Muscle of the nose.
        * Masseter: Primary muscle for chewing.
        * Zygomaticus: Muscle used for smiling.
        * Orbicularis oris: Muscle surrounding the mouth.
        * Buccinator: Compresses the cheeks.
        * Mentalis: Muscle of the chin.
        * Triangularis: Depresses the corner of the mouth.
        * Quadratus labii superioris: Elevates the upper lip.
        * Quadratus labii inferioris: Depresses the lower lip.
        * Digastricus: Muscle under the jaw.
Vascular and Nerve Supply
    * Blood Supply: Supplied primarily through the carotid arteries.
        * The carotid arteries split into internal and external branches.
        * Temporal artery: A specific branch of the external carotid artery that provides blood supply to the face.
    * Nerve Supply: The Trigeminal nerve (Cranial Nerve V) provides sensory and motor innervation to the face and head.
Salivary Glands
    * Parotid glands: Located in the cheek area in front of the ears.
    * Submandibular glands: Located beneath the floor of the mouth.
    * Sublingual glands: Located under the tongue.

Anatomy and Structural Components of the Neck

Skeletal and Vertebral Landmarks
    * Cervical Vertebrae ( $C1$ - $C7$ ): The neck is supported by seven cervical vertebrae.
    * Vertebra Prominens ( $C7$ ): The spinous process of the seventh cervical vertebra is a long, prominent landmark easily felt at the base of the neck.
    * Nuchal groove: The midline groove at the back of the neck.
    * Supraspinous ligament: Connects the tips of the spinous processes from the sacrum to $C7$ .
Major Muscles of the Neck
* Sternocleidomastoid: Acts to flex and rotate the head.
* Trapezius: Large muscle of the upper back and neck involved in moving the scapula and extending the head.
Endocrine and Respiratory Landmarks
    * Trachea: An important airway landmark.
    * Hyoid bone: A U-shaped bone in the neck that supports the tongue.
    * Thyroid cartilage: Commonly known as the Adam’s apple.
    * Cricoid cartilage: A ring of cartilage just below the thyroid cartilage.
    * Thyroid Gland: A butterfly-shaped endocrine gland; usually not palpable under normal conditions.
    * Parathyroid Glands: Small glands located on the posterior surface of the thyroid; usually not palpable.
Vascular and Neurological Structures of the Neck
    * Common carotid artery: Main blood supply to the head and neck.
    * Internal jugular vein and External jugular vein: Major venous drainage routes.
    * Left vagus nerve: A major cranial nerve traveling through the neck.
    * Thoracic duct: Part of the lymphatic system located in the lower neck area.
    * Subclavian vein: Located near the base of the neck.

Sensory Basics: Vision and Hearing

Vision Components
    * Structures: Cornea, retina, and the central fovea (the area of sharpest vision).
    * Neural Pathway: Consists of the optic nerves, optic chiasm, and optic tracts.
    * System Classification: The visual pathway is considered part of the central nervous system.
Hearing Components
    * External Ear: Includes the external auditory canal and the tympanic membrane (eardrum).
    * Middle Ear: Contains the ossicles (small bones) and the oval window.
    * Inner Ear: Features the cochlea, the organ of Corti (the actual organ of hearing), and the auditory nerve.

Lymphatic System of the Head and Neck

General Characteristics
* There are approximately $80$ lymph nodes located in the head and neck region.
* Drainage Pattern: Lymph nodes follow a specific drainage pattern. If a node is enlarged, it typically indicates inflammation or infection downstream (upstream of the node's drainage area).
Key Lymph Node Groups
    * Preauricular: In front of the ear.
    * Posterior auricular: Behind the ear.
    * Occipital: At the base of the skull.
    * Tonsillar: At the angle of the mandible.
    * Submental: Midline, behind the tip of the mandible.
    * Submandibular: Halfway between the angle and the tip of the mandible.
    * Superficial cervical: Overlying the sternocleidomastoid muscle.
    * Deep cervical chain: Deep under the sternocleidomastoid muscle.
    * Posterior cervical: In the posterior triangle along the edge of the trapezius muscle.
    * Supraclavicular: Just above and behind the clavicle, at the sternocleidomastoid muscle.

Lifespan, Cultural, and Health Disparities

Older Adults
    * Skin and Hair: Facial skin becomes wrinkled and sagging; skin lesions may appear; hair begins thinning.
    * Spinal Changes: An exaggerated concave curve of the spine may develop.
    * Mobility: Reduced Range of Motion (ROM) of the neck is common.
    * Thyroid Disorders: Increased incidence of Hypothyroidism and Hyperthyroidism.
Cultural Variations and Disparities
    * Variations exist in skin color and the shape of the eyes, nose, and lips.
    * Thyroid Prevalence:
        * Both Hypo- and hyperthyroidism are more common in females.
        * Hypothyroidism: Especially prevalent in older females.
        * Hyperthyroidism: Females are more likely to present with goiter as a cause; the highest prevalence is among premenopausal individuals.
    * Thyroid Cancer:
        * Occurs more frequently in females than males.
        * Incidence is highest among Asian/Pacific Islanders and Whites.

Priority Urgent Assessments

Acute Injuries and Neurological Changes
* Requires immediate stabilization of the head and neck; perform trauma assessments.
Neck Pain Clinical Significance
* Often related to muscle tension or spasms.
* Warning Sign: Neck pain accompanied by fever and headache may indicate serious conditions such as meningitis or cardiac events (MI).
Lymphatic Red Flags
* Nodes that are > 1\,cm in size, fixed, irregular, hard, or rubbery require emergency investigation for potential malignancy (cancer).
Thyroid Emergencies
    * Thyroid Storm (Thyroid Crisis): A state of extreme hypermetabolism affecting all systems.
        * Most common sign: Tachycardia.
        * Other symptoms: Tachypnea, nausea, vomiting, diarrhea, abdominal pain, anxiety, hyperkinesis, fever, and weakness.
    * Acute Bacterial Thyroiditis: Poses a high risk for airway compromise and severe thyroid dysfunction.

Subjective and Objective Data Collection

Subjective Assessment
    * Risk Factors: Evaluate past medical history, lifestyle/personal habits, medications (including thyroid meds), and family history.
    * Health Promotion: Teach injury risk reduction, prevention of thyroid complications, and importance of early detection of masses.
    * Cancer Risk Factors: Male gender, age over $50$ years, tobacco use, and alcohol consumption.
    * Common Symptoms: Headache, neck pain, limited movement, facial pain, lumps/masses, sleepiness, and symptoms of hypo/hyperthyroidism.
Objective Examination Techniques
    * Inspection: Head, facial features, hair, eyes, external ear, neck, trachea, and cervical spine.
    * Palpation: Temporal artery, scalp, thyroid, lymph nodes, and cervical spine/neck (testing flexion, hyperextension, and ROM).
    * Auscultation: Perform on the thyroid gland only if it appears enlarged.
    * Equipment Needed: Ambient lighting, penlight/flashlight, gloves, stethoscope, and a small cup of water (for swallowing during thyroid exam).
    * Patient Preparation: Remove wigs/hairpieces; wash hands; patient should be seated facing the examiner; explain the process and ask the patient to report discomfort.
Specialized Testing
    * Distance Vision: Snellen or Allen chart.
    * Near Vision: Jaeger test or newsprint.
    * Hearing Acuity: Whisper test.
Laboratory and Diagnostics
* Radiograph, CT, MRI, lumbar puncture, and thyroid function tests.

Questions & Discussion

Question 1: Is the following statement true or false? An expected finding with neck palpation is lymph nodes larger than $1\,cm$ in size.
* Answer: False.
* Rationale: Lymphatics larger than $1\,cm$ , fixed, irregular, hard, or rubbery require emergency investigation, as these signs raise the possibility of cancer.
Question 2: Is the following statement true or false? It is important for the nurse to always auscultate the thyroid gland during the comprehensive assessment.
* Answer: False.
* Rationale: Auscultating the thyroid is a focused assessment which should be completed only if the thyroid gland appears to be enlarged (to check for bruits).