Exam 4 Regional Anatomy; Vascularization Head & Neck; Axial Skeleton Flashcards
What are the arteries that furnish blood to the brain? (They are paired)
- Vertebral Arteries
- Internal Carotid Arteries
How many vertebrae are in each of the vertebral regions?
Cervical-- 7 Thoracic-- 12 Lumbar-- 5 Sacrum-- 5 fused Coccyx-- 4 fused
What are the four normal vertebral curves?
- Cervical & Lumbar (Anteriorly convex curves)
- Thoracic & Sacral (Anteriorly concave curves)
Intervertebral discs are found where?
2nd Cervical (axis) to sacrum
What is characterized by an abnormal increase in the thoracic curvature?
Kyphosis
Kyphosis may results from what?
Erosion of the anterior part of one or more vertebrae (demineralization resulting from osteoporosis)
What is characterized by an anterior rotation of the pelvis at the hip joints producing an abnormal increase in lumbar curvature?
Lordosis
What are some associated causes of Lordosis?
- Weakened trunk musculature
- Late pregnancy
- Obestity
What is characterized by an abnormal lateral curvature that is accompanied by rotation of the vertebrae?
Scoliosis
Which abnormal curvature is the most common deformity in pubertal girls?
Scoliosis
This abnormal curvature has the spinous processes turn toward the cavity of the abnormal curvature and the ribs protrude when bending over?
Scoliosis
What are the different structural parts of a vertebra?
Vertebral processes
Vertebral Arch
Vertebral Body
What is the name of the cervical vertebra that supports the skull and is the first cervical vertebra?
Atlas
Which cervical vertebra allows for side-to-side rotation of the head?
Axis
What transmits the vertebral arteries?
Transverse Foramina
What are the two craniovertebral joints?
Atlanto-occipital Joint- (Atlas & Occipital Bone)
Atlantoaxial Joint- (Atlas & Axis)
What type of joint are the craniovertebral joints?
Synovial Joint
This is a ring of bone & has the superior facets for the occipital condyles?
Atlas
This cervical vertebra has the dens (odontoid) process as the body?
Axis
What is the name of the strong ligament extending between right & left tubercles of C1 & holds the dens of C2 against the anterior arch of C1, forming the posterior wall of a socket for the dens?
Transverse Ligament
The Thoracic aorta supplies branches to what?
Pericardium Esophagus Bronchi Diaphragm Intercostal Chest Muscles Mammary Gland Skin Vertebrae Spinal Cord
What are the paired arteries that supply blood to the brain?
Vertebral Arteries
Internal Carotid Arteries
The vertebral arteries are direct branches of what?
Subclavian arteries
What foramina do the Vertebral arteries travel through heading toward the brain and pass through to get to the brain?
Travel: Transverse Foramina of the cervical vertebrae
Pass: Foramen Magnum
What do the vertebral arteries unit to form on the inferior posterior part of the brain?
Basilar Artery (single) on ventral surface of the pons
What arteries are branches of the common carotid artery and enter the skull through the carotid foramen (Carotid Canal)?
Internal Carotid Arteries
The Internal Carotid Arteries & External Carotid Arteries are branches of what?
Common carotid arteries (right & left sides)
The internal carotid arteries travel to inferior anterior surface of the brain and contribute to what?
Formation of CIRCLE OF WILLIS
-Supply blood to eyeballs & brain
The external carotid arteries supply blood to what structures?
Structures of the external skull as branches of maxillary & superficial temporal branches
What is the most important anastomosis in the body that connects posterior & anterior blood supplies to the brain?
Arterial Circle of Willis
What vessels make connections in the Circle of Willis?
Basilar Artery (formed from united vertebral arteries) interconnect with branches of the internal carotid arteries
What is the importance of the anastomosis called the Arterial Circle of Willis?
- Control of blood supply to brain when pressure varies in one or more major artery
- Alternate pathways if blockage or occlusion
Name the foramina and what portion of which bone the internal carotid arteries pass through to get to the cranial cavity?
Carotid Foramina (Carotid Canals) in the petrous part of the temporal bones
What vessels drain the head and neck?
External Jugular Vein
Internal Jugular Vein
What vessel do the External & Internal Jugular veins take blood to?
Superior Vena Cava
Where does the Dural Venous Sinuses empty into?
Internal Jugular Vein
Name the groups of Lymph nodes found on the head and neck?
Parotid Occipital Retroauricular (Mastoid) Deep Cervical Superficial Cervical Submental (anterior, inferior mandible) Submandibular (posterior to submental)
The thoracic duct drains lymph into venous blood at what junction?
Left Internal Jugular & Left Subclavian Veins
The Right Lymphatic Duct drains lymph into venous blood at what junction?
Right Internal Jugular & Right Subclavian Veins
What Plexus is formed from the ventral rami of spinal nerves C1-C5?
Cervical Plexus
The cervical plexus supplies nerve innervation of what areas?
Skin & Muscles of the Head, Neck, & Upper Shoulders
What other significant nerve arises from the C3-C5 portion of the Cervical plexus? Innervates what?
Phrenic Nerve
Innervates the Diaphragm
What nerve branch arising from the Cervical Plexus provides cutaneous innervation of skin of the neck & scalp posterosuperior to the auricle?
Lesser Occipital Nerve
What nerve branch arising from the cervical plexus provides cutaneous innervation of skin over the parotid gland, mastoid process, auricle, & area of skin from angle of the mandible to mastoid process (Posterioinferior part of face & inferior part of the auricle)?
Great Auricular Nerve
What nerve is a branch of the dorsal primary ramus of spinal nerve C2, not part of the Cervical plexus?
Greater Occipital Nerve
Where does the Greater Occipital Nerve arise from & emerges beneath what muscle?
Between vertebrae C1 & C2, emerges beneath obliquus capitis inferior muscle
The greater occipital nerve passes through what muscles after it emerges beneath obiquus capitis inferior?
Semispinalis Capitis & Trapezius Muscles
What does the Greater Occipital Nerve supply?
Skin along posterior scalp to the vertex
Disorders of the Greater Occipital Nerve may cause what? & is brought on (due to) by what reason?
Occipital Neuralgias
-Entrapped at the obliquus capitis inferior muscle
What nerve supplies the skin covering the anterior cervical region?
Transverse Cervical Nerve
Which nerves supply the skin over the shoulder?
Supraclavicular Nerves
Which nerve provides motor innervation of the infrahyoid muscles, Omohyoid, Sternohyoid, Sternothyroid?
Ansa Cervicalis
Which nerve provides motor innervation of the infrahyoid muscle, Thyrohyoid?
Hypoglossal Nerve (CN-XII)
Which muscles are the TMJ Muscles?
Temporal
Masseter
Lateral Pterygoid
Medial Pterygoid
Which triangle has the occipital triangle and Subclavian triangle in it?
Posterior Triangle
What separates the occipital triangle from the subclavian triangle?
Omohyoid (inferior belly portion)
What important structures lie within the Occipital Triangle?
- Occipital Artery (for which triangle is named)
- Accessory Nerve (CN-XI)
- Cervical Plexus
The Subclavian Triangle contains what important structures?
Subclavian Artery & Vein (for which triangle is named)
What other name may the Subclavian Triangle be called?
Supraclavicular Triangle
Name the subdivisions of the Anterior Triangle?
Submandibular Triangle
Carotid Triangle
Submental Triangle
Muscular Triangle
Which triangle is bounded inferiorly by the body of the hyoid bone, laterally by right & left anterior bellies of digastric muscles & the floor is the two mylohyoid muscles?
Submental Triangle
What is contained in the submental triangle?
Submental Lymph Nodes