Thoracic Spine and Rib Cage — Palpation Landmarks

Palpation Landmarks

T1–T12 Spinous Processes — Counting From C7

• How to find it: Locate C7 (vertebra prominens — the most prominent SP at the base of the neck, confirmed by the extension disappearance test described in anatomy/bones/cervical-spine-landmarks). T1 is the first spinous process below C7. From T1, count inferiorly along the midline, pressing gently on each successive bony point. Remember that thoracic SPs angle inferiorly — the tip of a thoracic SP may be one full vertebral level below its vertebral body (especially in the mid-thoracic region, T4–T9).
• What it feels like: Each SP is a narrow, pointed bony projection in the midline, separated from the next by a soft interspinous space. The upper thoracic SPs (T1–T3) are relatively horizontal and easier to count individually. The mid-thoracic SPs (T4–T9) angle steeply downward and overlap — they feel closer together and are harder to distinguish. The lower thoracic SPs (T10–T12) become more horizontal again and resemble lumbar SPs.
• Client position: Prone (standard) or seated with the thoracic spine flexed (which opens the interspinous spaces and makes counting easier).
• Confirmation: Cross-reference with known landmarks: T3 is at the level of the spine of the scapula (medial end). T7 is at the level of the inferior angle of the scapula (with the arms at the sides). T12 is identified by tracing the 12th rib medially to its vertebra (see Rib Counting Method below).
• Common errors: Miscounting due to the steep angulation of mid-thoracic SPs — the tip of T5's SP may actually lie over the body of T6. In kyphotic clients, SPs may be excessively prominent but widely spaced, making them easier to count. In muscular clients, the erector spinae cover the SPs and you must press firmly through the muscle to reach bone.
• Clinical significance: Thoracic SP levels serve as reference points for rib counting, scapular position assessment, organ level estimation (T4–T5 = tracheal bifurcation, T10 = lower margin of the lung posteriorly, T12 = kidney level), and segmental mobility testing. Tenderness or step-off at a single SP raises suspicion for facet joint dysfunction or, in trauma, compression fracture.

Rib Angles

• How to find it: With the client prone, locate a thoracic SP at the desired level. Move laterally approximately 3–4 cm from the midline. The rib angle is the point where each rib curves sharply anterolaterally from its posterior course. The angles are palpable as a column of bony points running vertically, approximately 3–4 cm lateral to the spinous processes.
• What it feels like: A subtle, rounded bony prominence at each level. The rib angles are less distinct than the SPs — they are buried under the erector spinae and require firm pressure through the muscle mass to palpate. Each angle feels like a small, smooth bump at the lateral edge of the erector spinae group.
• Client position: Prone. Thoracic flexion (bolster under the upper chest) slightly separates the rib angles and improves access.
• Confirmation: The rib angles form a consistent vertical column. If you press on one and slide laterally, you follow the rib shaft around the thorax — the bony continuity confirms you are on a rib and not a transverse process (which is shorter and ends after 2–3 cm).
• Common errors: Confusing the rib angle with the transverse process of the same-level vertebra. The TP is more medial (closer to the SP) and shorter. The rib angle is more lateral and is the beginning of the long rib shaft. Also, confusing the rib angles with the erector spinae muscle mass — press through the muscle to feel the bone.
• Clinical significance: The rib angle is the thinnest part of the rib and the most common site for rib fractures. Tenderness at a specific rib angle with a history of cough, direct blow, or compression suggests fracture. Also the site where rib mobilization techniques are applied — the therapist contacts the rib angle to assess and restore costovertebral joint motion.

Costochondral Junctions

• How to find it: With the client supine, locate the sternum in the anterior midline. Move laterally from the sternal border along any rib — the rib's bony shaft transitions to costal cartilage at the costochondral junction. This transition point is approximately 3–5 cm lateral to the sternal border for the upper ribs, and farther lateral for the lower ribs. The junctions of ribs 2–7 are most easily palpated.
• What it feels like: A subtle change in tissue quality — the hard rib bone transitions to the slightly softer (but still firm) costal cartilage. In some individuals, a small bump or step is palpable at the junction. In others, the transition is smooth.
• Client position: Supine with the arms at the sides.
• Confirmation: Press on the junction and ask the client to take a deep breath — the costochondral junctions move with rib expansion. Tenderness at the junction that reproduces the client's chest pain is suggestive of costochondritis.
• Common errors: Confusing the costochondral junction with the sternocostal junction (where the costal cartilage meets the sternum). The sternocostal junction is at the sternal border; the costochondral junction is lateral to it, where the rib bone itself ends.
• Clinical significance: Costochondritis (inflammation at the costochondral junction) produces anterior chest wall pain that can mimic cardiac pain. Tenderness is typically at ribs 2–5. Palpation that reproduces the client's chest pain helps differentiate musculoskeletal from cardiac origin — but always rule out cardiac causes first in clients with chest pain.

Sternal Angle (Angle of Louis) — T4/T5 Level

• How to find it: With the client supine, place your finger at the jugular notch (the dip at the top of the sternum). Slide inferiorly along the midline of the sternum. Approximately 5 cm below the jugular notch, you encounter a horizontal bony ridge — a palpable step or angulation where the manubrium meets the sternal body. This is the sternal angle.
• What it feels like: A distinct transverse ridge or bump across the anterior surface of the sternum. In some individuals it is a sharp step; in others it is a subtle angulation. It is always palpable if you press firmly enough.
• Client position: Supine.
• Confirmation: The second rib articulates with the sternum at the sternal angle. Once you locate the angle, slide your finger laterally — you should feel the second rib attaching at this level. This is the most reliable starting point for anterior rib counting (count downward from rib 2: the next rib below is rib 3, then rib 4, and so on).
• Common errors: Confusing the sternal angle with the ridge of a sternocostal joint. The sternal angle runs transversely across the full width of the sternum — it is not a point but a ridge. Also, starting rib counting from rib 1 anteriorly — rib 1 is deep to the clavicle and not easily palpable. Always start at rib 2 at the sternal angle.
• Clinical significance: The single most important anterior rib counting landmark. Corresponds to the T4–T5 vertebral level posteriorly. Marks the level of the tracheal bifurcation, the superior border of the pericardium, and the aortic arch. Used as the reference for thoracic expansion measurement (see Assessment Reference Points).

Jugular Notch (Suprasternal Notch)

• How to find it: With the client supine, place your fingertip at the midline of the neck and slide inferiorly. The jugular notch is the deep, U-shaped concavity at the very top of the sternum, between the two clavicles. Your fingertip settles into the notch naturally.
• What it feels like: A distinct, deep concavity. The sternal ends of both clavicles form the lateral boundaries. The floor of the notch is the superior border of the manubrium. The notch is approximately 2–3 cm wide and 1–2 cm deep.
• Client position: Supine or seated.
• Confirmation: The jugular notch is in the exact midline, between the medial ends of the two clavicles. It does not move with any motion. The trachea can be felt in the floor of the notch — it should be midline. Tracheal deviation (the trachea palpably shifted to one side) is a medical finding suggesting pneumothorax, mediastinal shift, or other thoracic pathology.
• Common errors: Pressing too deeply into the notch — the trachea, brachiocephalic vessels, and apices of the lungs are immediately posterior. Light palpation only.
• Clinical significance: Starting point for clavicle palpation (slide laterally to follow each clavicle). The jugular notch corresponds to approximately the T2 vertebral level posteriorly. Tracheal deviation palpated in the notch is a red flag requiring medical referral.

Manubrium

• How to find it: From the jugular notch, slide your finger inferiorly along the midline. The manubrium is the broad, flat superior portion of the sternum, extending from the jugular notch to the sternal angle. It is approximately 5 cm long.
• What it feels like: A broad, flat, slightly convex bony plate in the anterior midline. Its lateral borders articulate with the clavicles (sternoclavicular joints) and the first two ribs.
• Client position: Supine.
• Confirmation: The manubrium is bounded superiorly by the jugular notch and inferiorly by the sternal angle. It is continuous with both structures. The SC joints are palpable at its superolateral corners.
• Common errors: Confusing the manubrium with the body of the sternum below it. The sternal angle (the transverse ridge) marks the boundary between them.
• Clinical significance: The manubrium is thicker and stronger than the sternal body. Fractures here are rare and associated with high-energy trauma. The first rib attaches at the lateral border of the manubrium, deep to the clavicle — first rib dysfunction is assessed by palpating along the manubrium's lateral border. Sternal fracture (at the manubrium-body junction) is associated with thoracic spine fracture — always assess both.

Sternum Body

• How to find it: From the sternal angle, slide your finger inferiorly along the midline. The body of the sternum extends from the sternal angle to the xiphoid process — approximately 10 cm long. The costal notches for ribs 3–7 are along its lateral borders.
• What it feels like: A long, flat, slightly convex bony plate in the midline. It is narrower than the manubrium. You may feel subtle transverse ridges (sternebrae fusion lines) in some individuals.
• Client position: Supine.
• Confirmation: The sternal body is the flat midline structure between the sternal angle (above) and the xiphoid (below). Its lateral borders have the costal cartilage attachments.
• Common errors: Pressing too hard on the sternum — it overlies the heart and pericardium. Firm palpation is uncomfortable and unnecessary. Light sliding palpation is sufficient.
• Clinical significance: Rib counting reference — ribs 3–7 attach along the lateral borders of the body. Sternal tenderness may indicate costochondritis, sternal fracture, or in rare cases, bone marrow pathology. Post-sternotomy clients (cardiac surgery) will have a midline scar and may have sternal instability — avoid direct sternal pressure.

Xiphoid Process

• How to find it: From the sternal body, slide your finger inferiorly to the very bottom of the sternum. The xiphoid process is the small, pointed inferior tip of the sternum. It is located at the apex of the infrasternal angle (the V-shaped notch formed by the costal margins as they diverge from the sternum).
• What it feels like: A small, variable bony or cartilaginous projection approximately 2–4 cm long. In young individuals it is cartilaginous and flexible; with age it ossifies and becomes harder. It may point anteriorly, posteriorly, or be deviated to one side — this variation is normal.
• Client position: Supine.
• Confirmation: The xiphoid is at the inferior end of the sternum, in the midline. The costal margins of ribs 7 diverge laterally from it, forming the infrasternal angle. It is at the approximate level of T10 posteriorly.
• Common errors: Alarming the client — the xiphoid is sometimes quite prominent and may be mistaken for an abnormal mass by clients who discover it themselves. It is a normal structure. Also, pressing posteriorly on the xiphoid — the liver and diaphragm are immediately deep to it. Avoid posterior pressure.
• Clinical significance: Landmark for the inferior boundary of the heart and the superior attachment of the rectus abdominis and the diaphragm. The xiphoid corresponds to approximately the T10 vertebral level. Its position marks the upper boundary for abdominal palpation.

Rib Counting Method

1. Locate the sternal angle (angle of Louis).
2. Slide laterally from the sternal angle — the rib attaching here is rib 2.
3. Count downward from rib 2: the next intercostal space below rib 2 is the 2nd intercostal space; the next rib is rib 3, and so on.
4. Ribs 1–7 can be counted along the sternal border. Ribs 8–10 are counted along the costal margin. Ribs 11–12 are floating ribs palpated laterally and posteriorly.

1. Locate T12 by finding the 12th rib — the lowest rib, which is a short floating rib in the posterior flank.
2. From the 12th rib, count upward. The 12th rib is at the T12 level.
3. Cross-reference: rib 7 at the inferior angle of the scapula (approximately T7).

• Common errors in rib counting: Starting from rib 1 anteriorly — rib 1 is hidden deep to the clavicle and is unreliable as a starting point. Always use rib 2 at the sternal angle. Posteriorly, the steep angulation of thoracic SPs can cause miscounting. Cross-reference between anterior and posterior counts whenever possible.