Cervical Spine — Palpation Landmarks

Palpation Landmarks

C2 Spinous Process — First Palpable Cervical Spinous Process

• How to find it: With the client prone in the face cradle or seated with the head slightly flexed, place your fingertip on the EOP (the midline bump at the back of the skull). Slide inferiorly from the EOP. You will pass through a soft depression (the suboccipital space, approximately 2–3 cm wide) before reaching the first prominent bony point in the midline. This is the C2 spinous process.
• What it feels like: A wide, bifid (split-tipped) bony projection. It is the largest cervical spinous process by width. In some individuals the bifid split is palpable as two small points side by side; in others it feels like a single broad knob.
• Client position: Prone with the face in the face cradle, or seated with the head slightly flexed to open the posterior cervical spaces.
• Confirmation: The C2 spinous process is the first bony midline prominence below the occiput. Place your finger on it and ask the client to slowly rotate the head left and right — C2 rotates with the head (because C1 and the skull rotate on C2). You should feel the spinous process shift slightly under your finger during rotation. No other cervical spinous process moves this prominently with rotation.
• Common errors: Confusing C2 with the EOP. The EOP is on the skull, above the suboccipital soft tissue gap. C2 is below the gap. If there is no soft tissue depression above your finger, you are still on the skull, not the cervical spine.
• Clinical significance: Starting point for counting cervical vertebral levels downward. Approximately 50% of cervical rotation occurs at the C1–C2 (atlantoaxial) joint — restricted C2 rotation is a key finding in cervicogenic headache. The C2 nerve root exits here; irritation produces referred pain to the occipital region.

C1 Transverse Process — Anterior to the Mastoid

• How to find it: Locate the mastoid process (the prominent bone directly behind the earlobe). The C1 transverse process is approximately 1 cm inferior and slightly anterior to the tip of the mastoid, in the soft tissue between the mastoid and the posterior border of the mandibular ramus. Press gently into this space — the C1 TP is a small, rounded bony point deep to the superficial tissue.
• What it feels like: A small, firm bony point approximately the size of a pencil eraser. It is deeper and smaller than the mastoid process above it. The area is typically tender even in asymptomatic individuals because the internal jugular vein and the vertebral artery are nearby.
• Client position: Supine with the head in neutral, or side-lying with the upper side accessible. The client must be relaxed — any guarding makes this deep structure inaccessible.
• Confirmation: Place your finger on the C1 TP and ask the client to rotate the head toward the same side — the TP becomes more prominent and moves slightly into your finger (because C1 rotates with the skull). Rotation to the opposite side moves the TP away from your finger. This movement confirms you are on C1 and not on the mastoid (which does not move independently of the skull — but C1 rotates with the skull, so the movement is subtle relative to the mastoid).
• Common errors: Confusing the C1 TP with the mastoid process (larger, more superficial, directly behind the ear) or pressing too deeply and causing pain from vascular compression. The C1 TP is smaller and sits inferior-anterior to the mastoid. Use very gentle pressure — if the client reports a pulsation or radiating discomfort, reduce pressure immediately.
• Clinical significance: Palpated to assess C1 position and symmetry (bilateral comparison). Tenderness suggests upper cervical dysfunction, particularly at the atlanto-occipital or atlantoaxial joints. The suboccipital muscles (obliquus capitis inferior and superior) attach to C1 — hypertonicity of these muscles is palpable as increased tissue density around the C1 TP. Caution: The vertebral artery and internal jugular vein are immediately adjacent. Use brief, gentle palpation only.

C7 Spinous Process — Vertebra Prominens

• How to find it: With the client seated and the head slightly flexed (chin toward the chest), look at the base of the neck posteriorly. The C7 spinous process is the most prominent bony point at the cervicothoracic junction — the large bump at the base of the neck that becomes especially prominent with neck flexion.
• What it feels like: A single, non-bifid, rounded bony projection. It is longer and more prominent than the spinous processes above it (C3–C6) and projects more posteriorly. It is approximately the size of a pea or slightly larger.
• Client position: Seated with the head slightly flexed (this makes C7 more prominent). Also palpable prone, but flexion accentuates it.
• Confirmation: Place your finger on the prominent SP. Ask the client to extend the neck (look up) — C7 should become slightly less prominent but remain palpable. Here is the key test: the spinous process of T1 is directly below C7 and is often equally prominent. To distinguish C7 from T1, place a finger on each. Ask the client to extend the neck — C7 moves anteriorly (becomes less prominent) more than T1, because C7 is more mobile in extension. The one that "disappears" more with extension is C7.
• Common errors: The most common error is identifying T1 as C7. In approximately 20% of people, T1 is actually more prominent than C7. Use the extension test described above. Also, in some individuals, C6 is the most prominent cervical SP — again, the extension mobility test resolves this. Count upward from C7 to cross-reference: C7 is seven levels below C1 (count five SPs above C7 to reach C2, since C1 has no SP).
• Clinical significance: Anchor for counting thoracic levels downward and cervical levels upward. C7 is at the cervicothoracic junction — a transition zone where the mobile cervical spine meets the relatively rigid thoracic spine. Tenderness or prominence asymmetry at C7 may indicate facet joint dysfunction. Used as the plumb line reference for forward head posture assessment (ear canal should align over C7).

Cervical Transverse Processes (C3–C6)

• How to find it: With the client supine and the head in neutral, place your fingertips along the lateral aspect of the cervical spine, approximately 2–3 cm lateral to the midline spinous processes. The transverse processes are palpable as a column of small bony points in the paravertebral gutter, between the sternocleidomastoid anteriorly and the trapezius posteriorly. Start at C2 (the widest TP) and work inferiorly — each successive TP is slightly deeper and less distinct.
• What it feels like: A series of small, rounded bony projections, each approximately the size of a pencil tip. They are arranged in a vertical column. The cervical TPs are bifid (have anterior and posterior tubercles) — you may feel a slight cleft at each level. The anterior tubercles are generally less accessible than the posterior tubercles.
• Client position: Supine with the head in neutral and slightly rotated away from the side being palpated (this relaxes the ipsilateral SCM and improves access). A small towel roll under the cervical lordosis supports the neck.
• Confirmation: Press gently on a transverse process and maintain contact. The TP is a firm, immovable bony point that does not pulse. If you feel a pulse, you are on the carotid artery — move posteriorly. The TPs are posterior to the carotid artery.
• Common errors: Pressing anteriorly and palpating the carotid artery instead of the transverse process. The TPs are deep but more posterior than you expect. Also, pressing too hard — the cervical nerve roots exit between the TPs, and the vertebral artery passes through the transverse foramina. Sustained deep pressure on the TPs can cause nerve or vascular compression.
• Clinical significance: Used to assess segmental rotation and lateral flexion (compare bilateral TP prominence). Tenderness at a specific level suggests facet joint irritation or nerve root involvement at that segment. The scalenes attach to the transverse processes of C3–C7 — palpating along the TPs helps locate scalene attachments for treatment of thoracic outlet syndrome.

Carotid Tubercle (Chassaignac's Tubercle) — C6 Anterior Tubercle

• How to find it: Locate the cricoid cartilage in the anterior midline of the neck (the hard, complete ring below the Adam's apple). The cricoid cartilage sits at the C6 level. From the cricoid, move laterally approximately 3–4 cm — you are now at the anterior tubercle of the C6 transverse process, the largest anterior tubercle in the cervical spine.
• What it feels like: A prominent, rounded bony point deep to the sternocleidomastoid. It is noticeably larger than the adjacent cervical TPs. The common carotid artery runs directly anterior to it — you can compress the carotid against the carotid tubercle (this is how clinicians check the carotid pulse in the neck).
• Client position: Supine with the head slightly rotated away from the side being palpated.
• Confirmation: The carotid tubercle is at the same level as the cricoid cartilage (C6). If you press gently on the tubercle, you can feel the carotid pulse between your finger and the bone — the artery is being compressed against the tubercle.
• Common errors: Pressing too firmly or for too long — you are compressing the carotid artery against the bone. Brief palpation only. Sustained pressure can reduce cerebral blood flow. Never palpate both sides simultaneously.
• Clinical significance: The C6 level is a key anatomical cross-reference — the cricoid cartilage, the carotid tubercle, the inferior belly of the omohyoid, and the transition of the vertebral artery into the transverse foramina all occur at C6. Emergency medicine uses the carotid tubercle to compress the carotid artery in uncontrolled neck bleeding. For MTs, it is an orientation landmark for the mid-cervical region and a reminder that the carotid artery is vulnerable to pressure in this area.

Cricoid Cartilage — C6 Level Marker

• How to find it: Locate the thyroid cartilage (Adam's apple) in the anterior midline — the prominent shield-shaped structure with a midline notch at its superior border. Slide your finger inferiorly from the thyroid cartilage. The first hard, ring-shaped structure you encounter below the thyroid cartilage is the cricoid cartilage. It is approximately 1–2 cm below the inferior border of the thyroid cartilage.
• What it feels like: A firm, complete ring approximately 1 cm tall. Unlike the thyroid cartilage (which is open posteriorly), the cricoid cartilage is a complete ring — you can feel its anterior surface as a smooth, rounded bar. It is smaller and harder than the thyroid cartilage.
• Client position: Supine with the neck in neutral or slight extension.
• Confirmation: The cricoid is the only complete cartilaginous ring in the airway. It is hard and immovable relative to the tracheal rings below it (which are softer and C-shaped). It sits at the C6 vertebral level — the same level as the carotid tubercle laterally.
• Common errors: Confusing the cricoid with the first tracheal ring (which is immediately below and softer) or with the inferior border of the thyroid cartilage. The cricoid is distinctly harder and more prominent than the tracheal rings.
• Clinical significance: Cross-reference landmark for the C6 vertebral level. Marks the junction of the larynx and trachea and the junction of the pharynx and esophagus. In emergency medicine, cricothyrotomy is performed between the thyroid and cricoid cartilages. For MTs, the cricoid confirms C6 level when counting cervical vertebrae from the front.

Thyroid Cartilage — C4/C5 Level Marker

• How to find it: With the client supine, place your finger on the anterior midline of the neck at the most prominent projection. The thyroid cartilage (Adam's apple) is the largest laryngeal cartilage. Its superior border has a midline notch (thyroid notch) that is palpable as a V-shaped dip. In males, the thyroid cartilage is typically more prominent due to a narrower angle between the two laminae.
• What it feels like: A broad, shield-shaped cartilage with two laminae that meet at a midline angle. The superior notch is the most identifiable feature — a V-shaped dip at the top. The laminae are flat plates extending posterolaterally.
• Client position: Supine with the neck in neutral.
• Confirmation: Ask the client to swallow — the thyroid cartilage moves superiorly and returns. This is the definitive confirmation. No bony structure in the neck moves with swallowing.
• Common errors: Confusing the thyroid cartilage with the hyoid bone (which is above and smaller) or the cricoid cartilage (which is below and ring-shaped). The thyroid cartilage is the largest structure and has the distinctive notch.
• Clinical significance: Marks the C4–C5 vertebral level. The superior thyroid artery runs near the superior horn — avoid sustained deep pressure at the superior corners of the cartilage. Used as a reference for cervical vertebral level identification from the anterior approach.